[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
That bad run was an outlier. No idea what caused it, but cron'd tests over the past couple of days have all shown results similar to the pre-33 breakage. So it looks like this is finally fixed, thanks. It's a shame testing didn't catch it, but understandable. It's a bit more worrying that the regression took seven months to get repaired, but at least it's all good now. ** Changed in: linux (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Hooray, it seems that it has - but possibly only partially. Peak and Avg throughput were both a few % down compared to -32, but well within the sort of variance wifi suffers from. High-70s for download is certainly good enough to use. What's less encouraging, to the point of being an outright concern, is the UPLOAD rate. That has consistently peaked at 100Mb/s with -32 over the past several months, with averages not much lower, but remains massively worse in the current kernel: somewhere around 60Mb/s. I've only had time to run one batch of tests on it, so it could have been an extremely unlucky fluke, but like I say, it's worrying. I'll do some more testing when I get the chance. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Thanks, but that seems unlikely: I'm aware of the ant_sel issue on HP laptops etc, but this machine isn't one and has never benefitted from it. If it was using the wrong one of two antennae, it wouldn't hit 70/70 at 20ft away through walls, nor would the throughput be almost half of what it was with the good kernels when registering that signal quality. I'll try it to see, of course, but if it does fix it then the driver's got some drastic bugs with its information reporting! :P -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Although, I see what appears to be an unrelated (to ant_sel) + if (rtlpriv->cfg->ops->get_btc_status()) + rtlpriv->btcoexist.btc_ops->btc_power_on_setting(rtlpriv); added in that commit as well. I can't go digging into the source right now to see what that's doing, but since THIS bug reeks of bad power management you're hopefully right that the patch as a whole will also fix this issue. I'll try it over the weekend - thanks again for the heads up. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
This should be fixed in latest bionic kernel, LP: #1788997. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Still hopelessly broken. :( Throughput with the latest kernel was down to about 45Mb/s when I tested it a few days ago. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
given the link quality observations in #11 and the behavior in #12, it's pretty clear that the problem is with the radio power management. since it isn't improved at all via any of the PM settings, that suggests it's simply broken rather than overly-aggressive. for reference, the head for the last good version of the driver is 6A56582B1FEECB841E329C4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
the machine is usually ~20 feet away from the router, through multiple walls and a floor. i moved it last night so it was 6 feet away with LOS, and the results from that are very interesting: Linux brix 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-30 dBm Sat 20-Oct-18 17:23 429,840,384 100% 10.91MB/s0:00:37 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 11,167,414.42 bytes/sec and under the same ideal conditions: Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-32 dBm Sat 20-Oct-18 17:29 429,840,384 100%9.10MB/s0:00:45 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 9,449,350.66 bytes/sec so the newer kernel is MUCH better in that situation, whereas the old kernel essentially performs exactly the same. the machine has a fairly weak cpu, and basically has one core pegged with iowait during these transfers, so optimisations (either in general for meltdown etc, or the stack, or in the driver specifically) could certainly account for that sort of speedup. however, that only further highlights just how bad this regression is, because the driver is now nearly 20% faster in the abstract but still massively slower at range despite all that improvement. it also explains why nobody would notice the regression during development. i'm happy to test proposed fixes or provide more information, but i don't think there's anything more i can do at my end until somebody else steps in. @joseph - do you have a tracking reference for upstream yet? TIA -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
> prior to the transfer [on the buggy versions] the link quality is 62-64 and the signal similarly weaker because of power saving, but once packets are in flight it looks perfect -32 doesn't seem to have that problem: it's been 70/70 every time i've looked, even with the link speed showing as 15Mb/s rather than 150, indicating power saving. so i modprobed the driver with all the power- saving options (ips, fwlps, and aspm) set to 0 while running one of the broken kernels (i don't remember if it was -36 or the 4.19 build, sorry) to see if that made any difference, but AFAICT it didn't. (i.e. still around 55Mb/s, when -32 was hitting 70+ 5 mins before/after). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
> on channel 8(+4), 4.19 typically performed on par with -32 and older. apparently only because of some fluke. the router switched to 4(+8) some time in the past couple of days, and the newer kernels are certainly sucking hard on that too: --- Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.427 GHz (Channel 4) Link Quality=70/70 Signal level=-36 dBm Sun 07-Oct-18 03:30 429,840,384 100%9.00MB/s0:00:45 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 9,449,350.66 bytes/sec --- Linux brix 4.15.0-36-generic #39~16.04.1-Ubuntu SMP Tue Sep 25 08:59:23 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.427 GHz (Channel 4) Link Quality=64/70 Signal level=-46 dBm Sun 07-Oct-18 05:05 429,840,384 100%6.46MB/s0:01:03 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 6,665,821.01 bytes/sec --- this is a major regression. is there any activity on it upstream? i can't imagine it's ALL wifi, or people would be screaming for blood, but it would be good to at least get it in front of larry finger (the rtl driver author) as a starting point. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
so, the methodology is, reboot, wait for things to settle (i.e. for the initial "performance" cpu period ubuntu uses to pass), run a simple script that dumps out some diags and rsyncs that 400MB iso. -- Linux brix 4.19.0-041900rc6-generic #201809301631 SMP Sun Sep 30 16:32:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=62/70 Signal level=-48 dBm Wed 03-Oct-18 01:35 429,840,384 100%6.80MB/s0:01:00 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 7,106,536.45 bytes/sec --- Linux brix 4.15.0-34-generic #37~16.04.1-Ubuntu SMP Tue Aug 28 10:44:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=62/70 Signal level=-48 dBm Wed 03-Oct-18 01:40 429,840,384 100%6.38MB/s0:01:04 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 6,665,821.01 bytes/sec --- Linux brix 4.15.0-32-generic #35~16.04.1-Ubuntu SMP Fri Aug 10 21:54:34 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.452 GHz (Channel 9) Link Quality=70/70 Signal level=-32 dBm Wed 03-Oct-18 01:43 429,840,384 100%8.14MB/s0:00:50 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,348,455.44 bytes/sec -- that was the best run 4.19 had, at -18%, out of about a dozen. as with 4.15.0-33 and later most were down by 25-30%. so, "still exists" it is. here's where things get weird though... --- Linux brix 4.19.0-041900rc6-generic #201809301631 SMP Sun Sep 30 16:32:51 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Current Frequency:2.447 GHz (Channel 8) Link Quality=66/70 Signal level=-44 dBm Wed 03-Oct-18 01:12 429,840,384 100%8.07MB/s0:00:50 (xfr#1, to-chk=0/1) sent 429,945,420 bytes received 35 bytes 8,348,455.44 bytes/sec --- on channel 8(+4), 4.19 typically performed on par with -32 and older. on channel 9(+5) though it consistently showed the same regression as -33. again, this is over about a dozen runs (and multiple reboots switching between kernels), not a onetime event. -32 though consistently performed at 70+Mb/s averages regardless of channel. i'm way out of my depth at this point, but that seemed a remarkable weirdness and worth pointing out. :) ** Tags added: kernel-bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
ok - it's a failure in the doc, since the kernel image can't be installed without them. also note that the headers package can't be installed on 16.04 because of a change in the ?libssl? dependency. (from memory: might be the wrong dependency). that aside, the results with 4.19 are ... odd, so far. i need to test a bit more before committing to a call. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
sure, i'll try. sidenote, https://wiki.ubuntu.com/KernelMainlineBuilds is missing any reference to kernel modules, which seem like they might be kind of important for bugs like this. is that a failure in the doc, or is the goal here just to test e.g. the tcp changes in -33 rather than any changes in the device driver itself? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.19 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc6 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Tags added: kernel-da-key ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
marked as confirmed per #3 and #4. i have the apport file stashed away and can upload it as an attachment upon request if anyone's interested. ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
unfortunately, the instructions on https://help.ubuntu.com/community/ReportingBugs don't seem to work: >> If this is to be added to an existing bug report, also use the -u option: ubuntu-bug -c FILENAME.apport -u BUGNUMBER << $ ubuntu-bug -c /mnt/nas/wifi.apport -u 1795116 Usage: ubuntu-bug [options] [symptom|pid|package|program path|.apport/.crash file] ubuntu-bug: error: -u/--update-bug option cannot be used together with options for a new report and since -c is the only option that allows me to specify an apport file, i'm not sure how to proceed from here... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
obviously i've tested this with 32/33/34 a dozen or so times, but the performance regression shows up in all of them, so i've only copied that particular one. the best (i.e. "least bad for the bugged kernel") result so far was "only" -18%, and most runs are down by 25-30%. ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1795116] Re: large performance regression (~20-40%) in wifi with 4.15.0-33 and later
Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode. To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1795116/+editstatus and add the package name in the text box next to the word Package. [This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.] ** Tags added: bot-comment -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1795116 Title: large performance regression (~20-40%) in wifi with 4.15.0-33 and later To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1795116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
