Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:  fixed
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  029-backport, 031-unreached-backport, 032  |
  -unreached-backport, 029-backport-unreached|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by teor):

 * keywords:
 tor-relay, performance, windows, 029-backport, 031-unreached-backport,
 032-unreached-backport
 =>
 tor-relay, performance, windows, 029-backport, 031-unreached-backport,
 032-unreached-backport, 029-backport-unreached


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:  closed
 Priority:  Medium   |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:  fixed
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  029-backport, 031-unreached-backport, 032  |
  -unreached-backport|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by teor):

 * status:  merge_ready => closed
 * resolution:   => fixed


Comment:

 This seems simple enough to backport, but we have no way of noticing if it
 breaks, because we have no Windows CI on 0.2.9.

 It's also worth noting that the Windows CI that we have in 0.3.4 and later
 doesn't run traffic through sockets.

 Closing as "no backport".

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  029-backport, 031-unreached-backport, 032  |
  -unreached-backport|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by teor):

 It looks like `bug22798_029_squashed` was never pushed to
 https://gitweb.torproject.org/user/nickm/tor.git

 But from the merge history, it seems like it was commit 57eab23ea5.

 It's now:
 https://github.com/torproject/tor/pull/764

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:  Tor:
 |  0.2.9.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  029-backport, 031-unreached-backport, 032  |
  -unreached-backport|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by amj703):

 * cc: amj703 (removed)


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  merge_ready
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  032-backport 031-backport 029-backport |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by teor):

 * status:  needs_review => merge_ready


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.2.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  032-backport 031-backport 029-backport |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by nickm):

 * keywords:  tor-relay, performance, windows, review-group-29, review-
 group-30 =>
 tor-relay, performance, windows, 032-backport 031-backport
 029-backport
 * milestone:  Tor: 0.3.3.x-final => Tor: 0.3.2.x-final


Comment:

 Having heard no objections, merging this to master and marking for
 possible backport.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29, review-group-30   |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by nickm):

 added a fixup commit, and squashed it all into a new branch called
 `bug22798_029_squashed`.  Planning to merge it to master, and consider for
 backport.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29, review-group-30   |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by Vort):

 Thanks. Now it looks fine.
 [[span(style=color: #ABACAD, But same text left at /changes/bug22798, it
 may need fixing too.)]]

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29, review-group-30   |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by nickm):

 Thank you! I have tried to fix that comment.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29, review-group-30   |
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by Vort):

 > On Windows Vista and later, ...

 This comment is not precise.
 According to my tests (comment:119), bug is not reproducing with Windows
 8.1, that's why Windows 7 (kernel version 6.1) is the last version, for
 which fix is activated.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by nickm):

 Thanks for the updates!  I've put it in a branch `bug22798_029` against
 0.2.9, and confirmed that it merges cleanly to master.  I've asked a few
 other folks to look at it; I hope they'll have feed back for me today.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by Vort):

 * status:  needs_revision => needs_review


Comment:

 To make unencrypted upload testable, I have added fake command to control
 port protocol:
 {{{#!c
 } else if (!strcasecmp(conn->incoming_cmd, "AAA")) {
   int testchunksz = 4096;
   char* trb = malloc(testchunksz + 1);
   memset(trb, '0', testchunksz);
   trb[testchunksz] = '\0';
   for (int i = 0; i < 256; i++)
 connection_write_str_to_buf(trb, conn);
   connection_write_str_to_buf("\r\n", conn);
   free(trb);
 }}}
 Then executed test program from Ubuntu VM:
 {{{#!csharp
 static void Main(string[] args)
 {
 int testdatasz = 4096 * 256;

 TcpClient tc = new TcpClient();
 tc.Connect(args[0], int.Parse(args[1]));
 NetworkStream networkStream = tc.GetStream();
 var br = new BinaryReader(networkStream);
 var bw = new BinaryWriter(networkStream);
 bw.Write(Encoding.UTF8.GetBytes("AAA\n"));
 var sw = new Stopwatch();
 sw.Start();
 var a = br.ReadBytes(testdatasz);
 sw.Stop();
 var b = br.ReadBytes(2);
 if (b[1] != 10)
 throw new Exception();
 Console.WriteLine($"Bandwidth = {(int)(testdatasz / 1024.0 /
 sw.Elapsed.TotalSeconds)} KiB/s");
 }
 }}}
 With 10 Mbit / 150 ms connection, adding of `update_send_buffer_size()`
 call changes output from 77 KiB/s to 578 KiB/s.
 Strange thing is that such change does not allow to use full bandwidth of
 1220 KiB/s.
 But, anyway, it is better than nothing.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by Vort):

 * Attachment "tor_windows_upload_fix_v6.patch" added.


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by Vort):

 > Don't you want to address the issue in comment:9 too?

 I want this patch to be focused on one specific problem.
 Changing of Windows Sockets version have no effect on it.
 So it is better to make this change within the fixes for #11444.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by Vort):

 > What do you mean above when you say "It breaks build"?

 It was said only about v1 patch. Newer versions does not have such
 problem.

 > The function update_send_buffer_size should probably be static

 Yes, thanks. Changed it.

 > and it definitely needs documentation.
 > It should probably explain how it is doing that, and what exactly it is
 doing.

 My English is not good, so new description may need rewording.

 > I see above that you have done work on measuring the performance impact,
 both for the syscalls and for the network performance. Can you summarize
 the outcomes?

 According to [attachment:tor_sampling.png profiling results], `WSAIoctl()`
 and `setsockopt()` functions use 1% of CPU resources. But I am not sure
 about correctness of this result, since no API function is approaching 85%
 of CPU usage as mentioned in ticket #23433.
 Concerning network: in isolated environment, test program was able to
 accelerate to 4 MiB/s, which allows to think that there are no limit on
 upload speed after fix (or limit is high enough). Going back to real
 tests: without patch, upload speed for my relay on high latency link was
 50 KiB/s and BwAuth's weight was 20. With patch, all allocated bandwidth
 (3 MiB/s) is used by relay and weight is increased to 4000.

 >> Maybe non-encrypted connection requires update_send_buffer_size call
 too?
 > Yes, good idea.

 Are there any method to test upload speed with non-encrypted connections?
 And where that call should be placed? In `else` branch before `n_written =
 (size_t) result;` line?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-

Comment (by cypherpunks):

 Don't you want to address the issue in comment:9 too?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by Vort):

 * Attachment "tor_windows_upload_fix_v5.patch" added.


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by Vort):

 * Attachment "tor_sampling.png" added.


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by starlight):

 * cc: starlight@… (added)


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_revision
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by nickm):

 * status:  needs_review => needs_revision


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
-+-
 Reporter:  Vort |  Owner:  (none)
 Type:  defect   | Status:
 |  needs_review
 Priority:  Medium   |  Milestone:  Tor:
 |  0.3.3.x-final
Component:  Core Tor/Tor |Version:  Tor:
 |  0.2.9.11
 Severity:  Normal   | Resolution:
 Keywords:  tor-relay, performance, windows, |  Actual Points:
  review-group-29|
Parent ID:   | Points:  5
 Reviewer:   |Sponsor:
-+-
Changes (by nickm):

 * cc: pastly, robgjansen, amj703 (added)


Comment:

 This looks plausible to me.  The function `update_send_buffer_size` should
 probably be static, and it definitely needs documentation.

 What do you mean above when you say "It breaks build"?

 You ask above:

 >Is it is ok to compare result >= 0 or it should be result > 0?

 These are probably both okay.

 >Maybe non-encrypted connection requires update_send_buffer_size call
 too?

 Yes, good idea.

 >What is the good description for the function? Fix slow upload for
 Windows Vista and Windows 7 (bug #22798) would be enough?

 It should probably explain how it is doing that, and what exactly it is
 doing.

 >Is this code compatible enough with C compilers?

 It looks like it shouldn't cause a problem outside Windows.  I don't see
 any likely issues here.


 Other things:

  * I'm adding the KIST people to the cc list, since I think they might
 have ideas about send-window stuff.
  * I see above that you have done work on measuring the performance
 impact, both for the syscalls and for the network performance.  Can you
 summarize the outcomes? I'm having a hard time understanding what the
 measurements actually say.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:  (none)
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  0.3.3.x-final
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Applies and compiles good at
 
[https://gitweb.torproject.org/tor.git/commit/?id=c8c258a4333815e195097a59801397dd7a169828
 c8c258a4].
 Binary was not tested, but it should be fine too.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:  (none)
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  0.3.3.x-final
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---
Changes (by teor):

 * milestone:  Tor: unspecified => Tor: 0.3.3.x-final


Comment:

 Hi, sorry we missed this, it was in the wrong milestone,
 It should get reviewed in the next few weeks.

 Can you check if the patch applies to master?

 It's at:

 git clone https://git.torproject.org/tor.git

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:  (none)
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Patch is updated to match 0.3.2.9 code.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:  (none)
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---
Changes (by Vort):

 * Attachment "tor_windows_upload_fix_v4.patch" added.


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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  needs_review
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---
Changes (by Vort):

 * status:  new => needs_review


Comment:

 I think this patch is ready for review.
 Questions:
 1. Is it is ok to compare `result >= 0` or it should be `result > 0`?
 2. Maybe non-encrypted connection requires `update_send_buffer_size` call
 too?
 3. What is the good description for the function? `Fix slow upload for
 Windows Vista and Windows 7 (bug #22798)` would be enough?
 4. Is this code compatible enough with C compilers?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 New iteration of the patch: attachment:tor_windows_upload_fix_v2.patch​
 * I have found better place for `update_send_buffer_size` function.
 * Version check was added.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > What will happens for win x128 or some another specific case

 I guess they will not change it:
 [[https://msdn.microsoft.com/en-
 us/library/windows/desktop/aa383751(v=vs.85).aspx|An unsigned LONG. The
 range is 0 through 4294967295 decimal]].

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Here is my attempt to fix this problem

 SO_SNDBUF accept int, while SIO_IDEAL_SEND_BACKLOG_QUERY returns ULONG, no
 difference if sizeof(int)==sizeof(long). What will happens for win x128 or
 some another specific case, can setsockopt parse such input correctly?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 I have made a test with Windows 8.1 (6.3.9600) and WANem 40Mbit/150ms.
 And maximum speeds for `BwTest -s -u` and `BwTest -s -u -t` appeared to be
 the same: 4475 KiB/s.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Here is my attempt to fix this problem:
 attachment:tor_windows_upload_hackfix_v1.patch

 It breaks build, but allows to produce tor.exe for testing.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > You need to fill send queue by real data.

 And amount of that data depends on relay's bandwidth (or even on
 RelayBandwidthRate).
 This amounts will be megabytes, not gigabytes.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > It would be good to create a test with thousands of connections and
 different buffer sizes and see how much RAM it will actually use (with
 RamMap, for example)

 I believe it depends actual data, requesting 4M of SO_SNDBUF doesn't leads
 to 4M usage. You need to fill send queue by real data. So memory usage
 depends peers. Someone could to exploit it by filling system memory while
 your process doesn't aware about it, or something could go wrong for
 another reasons.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > except maybe to limit maximum values for relays, 4MB is way to crash
 relay (or do dos against entire system) with thousands connections

 It would be good to create a test with thousands of connections and
 different buffer sizes and see how much RAM it will actually use (with
 RamMap, for example)

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Yet again, ISB was equal to 65536 all time of the test.

 Yes, this ISB really works correctly with real peers.I tested average
 linux for auto-tuning of SNDBUF, it raises buffer similar way and never
 shrinks it later. ISB is way to fix broken upload on windows, except maybe
 to limit maximum values for relays, 4MB is way to crash relay (or do dos
 against entire system) with thousands connections.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Here is the test for WSAIoctl/setsockopt performance.
 `BwTest.exe -s -u -t` was started on Windows 7 computer with real 100
 Mbit/s and 1 ms link.
 Yet again, ISB was equal to 65536 all time of the test.
 Result: WSAIoctl and setsockopt functions uses 0.25% of CPU resources,
 comparing to other WS2_32 functions.
 attachment:isb_performance.png

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > It's not Linux, which accelerated my relay, but NAT from VirtualBox?

 According to manual VirtualBox tunes buffers for itself yet, effectively
 disables host optimizations if any exists.
 > The VirtualBox NAT stack performance is often determined by its
 interaction with the host’s TCP/IP stack and the size of several buffers (
 SO_RCVBUF and SO_SNDBUF ). For certain setups users might want to adjust
 the buffer size for a better performance. This can by achieved using the
 following commands (values are in kilobytes and can range from 8 to 1024)
 > Each of these buffers has a default size of 64KB

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Tuned window size, it really doesn't changes per recved dozen KB if you
 allow to use dozen MBs. Still, can't trigger test win7 in VM to send more
 bytes.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > peers promotes huge tcp window 500K - 1M

 And no change, how possible?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Btw, peers promotes huge tcp window 500K - 1M, my local test didn't show
 such values.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Regular users also can be affected by this problem?

 Not sure.

 > It's not Linux, which accelerated my relay, but NAT from VirtualBox?

 Yes, NAT-ed VM strips guest's tcp/ip stack, performance will depend host
 entirely for such case.

 > Results are less stable, but upload to 13B2354C still can go up to 450
 KiB/s:

 Mystery of Windows.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Try to disable it for network adapter, to test real windows 7 upload
 speed.

 Results are less stable, but upload to 13B2354C still can go up to 450
 KiB/s:
 attachment:tor_upload_without_lso.png

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Do the latest results means that
 1. Regular users also can be affected by this problem?
 2. It's not Linux, which accelerated my relay, but NAT from VirtualBox?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > upload good when

 "good" as it was 64KB buffer, that is NIC buffer for offloaded data.  It
 seems LSO (TSO) just hides broken windows tcp stack. Try to disable it for
 network adapter, to test real windows 7 upload speed.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > But for E555B09C I am getting 67 KiB/s (instead of 454 KiB/s for VM
 test), for 13B2354C - 462 KiB/s:

 Look Len=8192, seems your upload good when
 https://en.wikipedia.org/wiki/Large_segment_offload works, but it doesn't
 work reliably?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Can you inspect your tor client traffic to high latency peer to find how
 fast answers arrived?

 Strange things happens.

 This test is the same upload test, which I have used in VM with NAT, but
 on the host.
 Selected guards have similar pings.
 But for E555B09C I am getting 67 KiB/s (instead of 454 KiB/s for VM test),
 for 13B2354C - 462 KiB/s:
 attachment:upload_difference.png

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Might be your uplink installed some accelerator that behaves like
 transparent proxy for outgoing connections? Can you inspect your tor
 client traffic to high latency peer to find how fast answers arrived?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > From manual for VirtualBox:

 This means just that NAT is as bad as localhost for testing.
 But isolated network gives different results too :/

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > There may be lot of reasons why localhost tests will give incorrect
 results.

 From manual for VirtualBox:
 > The network frames sent out by the guest operating system are received
 by VirtualBox’s NAT
 engine, which extracts the TCP/IP data and resends it using the host
 operating system. To an
 application on the host, or to another computer on the same network as the
 host, it looks like
 the data was sent by the VirtualBox application on the host, using an IP
 address belonging to the
 host. VirtualBox listens for replies to the packages sent, and repacks and
 resends them to the
 guest machine on its private network.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Tested NAT-ed guest Win7 with "BwTest.3.exe -c ip_of_local_host -u"

 There may be lot of reasons why localhost tests will give incorrect
 results.

 For example:
 > Tested with latency 1, 5, 10, it wants 2M (probably depends maximum size
 of system memory) always.

 I've made a test with real Win7<->Win7 100 Mbit/s WiFi link (pings ranging
 from 1ms to 100ms and higher, but, usually they are in range from 1ms to
 10ms).
 And `BwTest -c ip -u -t` did not raised ISB beyond 65536.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Tested NAT-ed guest Win7 with "BwTest.3.exe -c ip_of_local_host -u" (yet
 moded to report SNDBUF on start and later). When NAT-ed it connects to
 host's "bwtest -s -d" over "lo" interface, so added delay to "lo" and got
 ping 500ms. It uploads faster than usual 53KiB/s but reported SNDBUF ==
 8KB anyway. In guest's wireshark ACKs have no delays. WAN latency doesn't
 affect tcp data in NAT mode, guest communicates internally with VM process
 on host without host's tcp stack: all acks appears immediately, peer's
 tcp_window differs, etc. VM process behaves like proxy for guest in NAT
 mode.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Or VM simulation is inaccurate somewhere.
 Here is upload test with NAT-ed VM and guard
 
[[https://atlas.torproject.org/#details/E555B09C77036733E00A7D61CD534BA9AF4AA232|E555B09C]]
 (ping = 124 ms from my location):
 attachment:tor_vm_fast_upload.png

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Or triggered by some peer's params like tcp window.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Win7 detects we tries to fool it with VM and disables super exclusive
 feature :)

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Sadly, updates did not helped me to reproduce inbound/outgoing difference.
 But now I know that outgoing upload for relay and for client not differs.
 Both of them shows ~50 KiB/s in isolated VM.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Probably that is because host and guest have different sets of OS
 updates.

 Microsoft probably fixed silently and partially somedays before. My VM
 with "outdated" win7 too. Tried almost everything, redirected for internet
 detection, assigned public ip addr, connected to 443 port. nada, 53KiB/s
 per 150ms as hard coded.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Can't reproduce inbound/outbound difference with VM and isolated Tor
 network.
 Probably that is because host and guest have different sets of OS updates.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Is it hard to make isolated Tor network?

 [/wiki/doc/TorChutneyGuide Chutney], except windows case probably.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > I don't trust windows to get internet connection.

 Is it hard to make isolated Tor network?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > btw, your win7 via wanem isolated from internet?

 Yes.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Maybe I am doing something wrong.
 > So please try to reproduce this thing.

 I don't trust windows to get internet connection. My virtual env isolated.
 Maybe it is reason for non reproducible result with outbound connections.
 btw, your win7 via wanem isolated from internet?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Maybe routes were different with different latency?

 This is how tests were made:

 Two Tor instances was launched at the same Windows 7 computer:
 TorClient and TorRelay.

 Then I made a 3-hop circuit via control port of TorClient: refEntry,
 myRelay, refExit.
 Attached stream and downloaded test file from 38.229.72.16 via SOCKS port
 of TorClient.
 This test forced refEntry to make a connection to myRelay.
 Then download command forced my relay to upload data to refEntry.
 I guess, that ping between myRelay and refEntry is somewhere near 150 ms.
 This test produced 52 KiB/s.

 Next test:
 Restarted TorRelay (which is dropping connection from refEntry to
 myRelay).
 Connected to control port of '''TorRelay'''.
 Created the 2-hop circuit refEntry, refExit.
 This is forced outgoing connection from TorRelay to refEntry.
 Next part is identical to test one:
 ''3-hop circuit via control port of '''TorClient''': refEntry, myRelay,
 refExit and file download''
 But since TorRelay <-> refEntry connection is already established,
 incoming connection is not created.
 I don't know if Tor creating new outgoing connection or reusing existing,
 but I don't see incoming connection in this case.
 This test produces 464 KiB/s.

 Maybe I am doing something wrong.
 So please try to reproduce this thing.

 If your ping to refEntry is not 150 ms, then select another refEntry.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > If connection is initiated from my relay to remote relay, then speed is
 464 KiB/s.
 > If from remote relay to my relay, then 53 KiB/s.

 Maybe routes were different with different latency?
 Just testing, 464 KiB/s is about 16-18ms.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Might be changes something for sockets in windows.

 Nothing changes, 53KiB/s on link with 150ms latency. Anyway, it requires
 OutboundBindAddress options enabled to bind anything.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > But effect is different for Tor.
 > Rechecked that again.
 > If connection is initiated from my relay to remote relay, then speed is
 464 KiB/s.
 > If from remote relay to my relay, then 53 KiB/s.

 Tor does bind for non-loopback addresses after connecting to outside
 {{{
   if (bindaddr && bind(s, bindaddr, bindaddr_len) < 0) {
 *socket_error = tor_socket_errno(s);
 log_warn(LD_NET,"Error binding network socket: %s",
  tor_socket_strerror(*socket_error));
 tor_close_socket(s);
 return -1;
   }
 }}}
 Might be changes something for sockets in windows.

 But 464 KiB/s still sounds like 64K buffer on link with 150ms latency,
 better than 8k but non optimal.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Looks like socket buffers in Windows are located in
 [[https://support.microsoft.com/en-us/help/931311/the-heavy-use-of-
 winsock-programs-may-exhaust-the-nonpaged-pool-memory|Nonpaged Pool]].
 Now tor.exe have 966 connections. And Nonpaged Pool have size of 255 MiB
 (checked with RamMap).
 Still not 480 MiB.
 I will look at this numbers again, when connection count changes.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > But I don't see where are the wasted 262144 * 2 * 1100 = 550 MiB are
 located.

 Linux doesn't report sockets' buffers per process as well, you can to send
 4M to queue without any additional memory reported for your process. But
 you can to count queues from netstat, or to read used memory for all
 sockets reported by /proc/net/sockstat

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > - Видишь суслика?
 > - Нет

 He have no place to hide.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Here is the new version of test program:
 attachment:BwTest.3.cpp​
 Now it uses non-blocking mode and fully compatible with Linux.

 With this version, speed now is 52 KiB/s (instead of 80 KiB/s for previous
 version).
 Which is more close to what I observe with Tor.

 > Both inbound and outbound connection affected by this bug.

 That is strange.
 I see the same thing with the test program.
 But effect is different for Tor.
 Rechecked that again.

 One more confirmation of inbound/outbound difference is that in case of
 their equality, regular Windows users would see very slow upload speed in
 many cases.
 But this is not the case.

 Most likely, reproduction is still not accurate enough.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 https://social.technet.microsoft.com/Forums/windows/en-US/d047ba5c-
 9c25-4089-85fc-569693870d71/winsock-send-buffer-size-
 windows-7?forum=w7itpronetworking

 > Hi dear technicians,

 > Something is wrong or I don't get is right what's with winsock ?

 > look:

 > when I set in netsh: netsh winsock set autotuning on

 > I receive this message => Winsock send autotuning is disabled.

 > when I set in netsh: netsh winsock set autotuning off,

 > I receive this message=> Winsock send autotuning is enabled.

 > HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\AFD\Parameters\

 > REG_DWORD "DynamicSendBufferDisable"

 > setting this value to 0, I receive this message => Winsock send
 autotuning is disabled.

 > setting this value to 1, I receive this message => Winsock send
 autotuning is enabled.

 > I think, something is inverted or I am wrong!?

 Haha, doesn't works for me neither. Probably code just missed.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > And I'm not sure that this test reproduces the problem with 100%
 accuracy.

 At least SNDBUF reported as 8k and speed depends latency for outbound
 connection, it doesn't tries to adapt send buffer size to connection
 itself. Both inbound and outbound connection affected by this bug.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > I tested this code with IDEAL_SEND_BACKLOG for virtual (unlimit) low
 latency local link (guest win7 to host linux), it goes to grow buffer to
 2M without any reason, if to keep report ideal buffer (it says 64k)
 without actual changes (system default sndbuf reported as 8k) then it
 transfer with the same speed as with 2M buffer size.

 Tested with latency 1, 5, 10, it wants 2M (probably depends maximum size
 of system memory) always.

 Outbound connection behaves differently, if some real latency present
 (1ms, 10ms) it doesn't tries to get all available bw, IDEAL_SEND_BACKLOG
 returns 64k every time.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > But I don't see where are the wasted 262144 * 2 * 1100 = 550 MiB are
 located.

 > - Видишь суслика?
 > - Нет
 > - И я не вижу. А он есть.
 > - Понял

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 I tested this code with IDEAL_SEND_BACKLOG for virtual (unlimit) low
 latency local link (guest win7 to host linux), it goes to grow buffer to
 2M without any reason, if to keep report ideal buffer (it says 64k)
 without actual changes (system default sndbuf reported as 8k) then it
 transfer with the same speed as with 2M buffer size.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Then again, is that true for outbound connection too? Or only incoming
 connections broken?

 This test requires complete rewrite (and port) of BwTest.
 And I'm not sure that this test reproduces the problem with 100% accuracy.
 So maybe I will do this, but not right now.

 Another thought:
 Right now I am running the relay with ~1100 established connections.
 It is official 0.3.0.8 build with `ConstrainedSockSize 262144` tweak.
 But I don't see where are the wasted 262144 * 2 * 1100 = 550 MiB are
 located.
 tor.exe have only 118 MiB of "Private Bytes" and 259 MiB of "Virtual Size"
 used.
 Not much higher than freshly started tor.exe process uses: 55 MiB and 161
 MiB respectively.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > I guess connection via WANem is almost like connection via real WAN with
 loss and jitters, every moment is unique.

 You can't get 3209 KiB/s on 10 Mbit/s link.
 So WANem is not perfect (or, maybe, I've made some configuration mistakes
 somewhere).

 > and seems like it never shrinks in Windows7

 Looks like so.
 But if WANem produces bandwidth spikes, this also can be the reason for
 absence of shrinking.

 By the way, I wasn't able to make IDEAL_SEND_BACKLOG grow beyond 4194304,
 even on 100 Mbit/s link.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Yes, but it should be enabled.
 > `netsh winsock show autotuning` -> enabled.
 >
 > Maybe something is just preventing it from working correctly.

 Then again, is that true for outbound connection too? Or only incoming
 connections broken? Maybe Microsoft limits incoming connection such way
 for non-server (non ultimate or something) editions?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Now I am almost sure that bandwidth drops are due to WANem limiting.
 > But I don't have a real 10 Mbit/150 ms link for testing purposes.

 I guess connection via WANem is almost like connection via real WAN with
 loss and jitters, every moment is unique. Ideal buffer size is result of
 such conditions, and seems like it never shrinks in Windows7.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Another thing worth trying is setting SO_SNDBUF=IDEAL_SEND_BACKLOG after
 every send().
 (No v/2 with this test)
 Results:
 {{{
 bw = 410 KiB/s, buf = 262144
 bw = 2953 KiB/s, buf = 2097152
 bw = 3209 KiB/s, buf = 4194304
 bw = 165 KiB/s, buf = 4194304
 bw = 356 KiB/s, buf = 4194304
 bw = 287 KiB/s, buf = 4194304
 bw = 2093 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1194 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1190 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 }}}
 Now I am almost sure that bandwidth drops are due to WANem limiting.
 But I don't have a real 10 Mbit/150 ms link for testing purposes.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > But anyway, with v/2, buffer grows even larger.

 Guess v*2 doesn't buffer grows

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > I will try to raise memory amount for WANem VM and perform test again.

 Not helps.
 Same drop to 2 KiB/s.
 Don't know what exactly it means.

 But anyway, with v/2, buffer grows even larger.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 I will try to raise memory amount for WANem VM and perform test again.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Interesting, is it really need 2M for send buffer to reach 1M/s with
 your test link?

 Maybe this depends on how WANem limiting is implemented?

 > Maybe to set SNDBUF values to v/2 and to watch values again?

 Results are strange:
 {{{
 bw = 60 KiB/s, buf = 65536
 bw = 233 KiB/s, buf = 131072
 bw = 441 KiB/s, buf = 262144
 bw = 874 KiB/s, buf = 524288
 bw = 1257 KiB/s, buf = 1048576
 bw = 1437 KiB/s, buf = 2097152
 bw = 1693 KiB/s, buf = 4194304
 bw = 2199 KiB/s, buf = 4194304
 bw = 113 KiB/s, buf = 4194304
 bw = 2 KiB/s, buf = 4194304
 bw = 1900 KiB/s, buf = 4194304
 bw = 1185 KiB/s, buf = 4194304
 bw = 1190 KiB/s, buf = 4194304
 bw = 1189 KiB/s, buf = 4194304
 bw = 1194 KiB/s, buf = 4194304
 }}}

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Interesting, is it really need 2M for send buffer to reach 1M/s with your
 test link?
 Then why it reports
 {{{
 bw = 1237 KiB/s, buf = 1048576
 }}}
 it's already reached 1M/s while SNDBUF previously was set to 256k
 Maybe to set SNDBUF values to v/2 and to watch values again?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 attachment:BwTest.2.cpp​, Win7->Ubuntu:

 {{{
 bw = 60 KiB/s, buf = 65536
 bw = 437 KiB/s, buf = 262144
 bw = 1237 KiB/s, buf = 1048576
 bw = 1108 KiB/s, buf = 2097152
 bw = 2496 KiB/s, buf = 2097152
 bw = 1529 KiB/s, buf = 2097152
 bw = 1189 KiB/s, buf = 2097152
 bw = 1194 KiB/s, buf = 2097152
 bw = 1189 KiB/s, buf = 2097152
 bw = 1189 KiB/s, buf = 2097152
 bw = 1190 KiB/s, buf = 2097152
 }}}

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 Can you test what values returned for SIO_IDEAL_SEND_BACKLOG_QUERY and
 what dynamic for them?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Maybe this code is capable of 1 MiB/s too.

 Yes, with Win7->Ubuntu transfer, speed reaches 1190 KiB/s.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > Test it with your BwTest.cpp​ (update buffer size once a second while
 compute speed)

 80 KiB/s -> 400 KiB/s
 Nice.
 Need to test with some Linux instead of Windows XP.
 Maybe this code is capable of 1 MiB/s too.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > Maybe something is just preventing it from working correctly.

 Or maybe just a bug inside windows code.

 Look at filezilla code for something like (this is a copy/paste from some
 old code, something can be wrong):
 {{{
 static void update_tcp_send_buffer_size(SOCKET s)
 {
 ULONG v = 0;
 DWORD outlen = 0;

 #ifndef SIO_IDEAL_SEND_BACKLOG_QUERY
 #define SIO_IDEAL_SEND_BACKLOG_QUERY 0x4004747b
 #endif

 if (!p_WSAIoctl(s, SIO_IDEAL_SEND_BACKLOG_QUERY, 0, 0, , sizeof(v),
 , 0, 0)) {
 p_setsockopt(s, SOL_SOCKET, SO_SNDBUF, (const char*),
 sizeof(v));
 }
 }
 }}}
 Test it with your BwTest.cpp​ (update buffer size once a second while
 compute speed)
 Actually 2 lines of code to test.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > There no facts auto-tuning is enabled at any settings for your case

 Yes, but it should be enabled.
 `netsh winsock show autotuning` -> enabled.

 Maybe something is just preventing it from working correctly.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by cypherpunks):

 > When auto-tuning is enabled, speed is 50 KiB/s.
 > When it is disabled (via ConstrainedSockSize), speed is 400 KiB/s.

 > But this is not enough information to make a conclusions.

 There no facts auto-tuning is enabled at any settings for your case, with
 default buffer size (assume 8k) speed is 50KiB/s while with modified
 (256k) speed is 400 KiB/s.

 256k by default for recv and send will make popular windows relays to use
 more memory than linux relays, it's way for new ticket "Windows relay is
 several times more hungry than Linux relay".

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Here is strace result, just for completeness:
 attachment:strace.txt

 It turns out, that those 4 KiB send()s are good for Linux, but bad for
 Windows?

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > See #22848 for the equivalent mingw-w64 bug.

 Other way round.

 When auto-tuning is enabled, speed is 50 KiB/s.
 When it is disabled (via ConstrainedSockSize), speed is 400 KiB/s.

 But this is not enough information to make a conclusions.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by teor):

 See #22848 for the equivalent mingw-w64 bug.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 > The tor bundles use mingw, not cygwin.

 And mingw is a good choice.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by teor):

 Replying to [comment:51 Vort]:
 > It is better to investigate why cygwin can be faster, even without
 SO_SNDBUF.

 The tor bundles use mingw, not cygwin. Sorry for not working that out
 sooner.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 Probably, the only thing which is matters, is the buffer size, which is
 passed to send().
 If I change 4097 in my code to 32768, speed rises from 80 KiB/s to 310
 KiB/s.
 Even without SO_SNDBUF.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 It is better to investigate why cygwin can be faster, even without
 SO_SNDBUF.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by teor):

 I logged #22847 to upgrade the Tor windows builds to cygwin 2.7.0.

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Re: [tor-bugs] #22798 [Core Tor/Tor]: Windows relay is several times slower than Linux relay

[Tor Bug Tracker & Wiki]

#22798: Windows relay is several times slower than Linux relay
---+---
 Reporter:  Vort   |  Owner:
 Type:  defect | Status:  new
 Priority:  Medium |  Milestone:  Tor:
   |  unspecified
Component:  Core Tor/Tor   |Version:  Tor: 0.2.9.11
 Severity:  Normal | Resolution:
 Keywords:  tor-relay performance windows  |  Actual Points:
Parent ID: | Points:  5
 Reviewer: |Sponsor:
---+---

Comment (by Vort):

 I was wondering what is the key for good iPerf speed.
 Launched API Monitor and saw SO_SNDBUF with size = 212992.
 But it was coming not from iperf3.exe, but from cygwin1.dll.
 Digging into that library revealed that this part of code was recently
 disabled:
 https://github.com/mirror/newlib-
 cygwin/commit/609d2b22afc63d80029a4fe85e64b51c84ccae08

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