This bug was fixed in the package lmbench - 3.0-a9-1.1ubuntu0.1
---
lmbench (3.0-a9-1.1ubuntu0.1) xenial; urgency=medium
* d/p/dynamic-tcp-backlog.dpatch: Dynamically increase the TCP backlog on
high core-count systems. (LP: #1706735)
-- dann frazier Mon, 16 Oct 2017 15:37:0
This bug was fixed in the package lmbench - 3.0-a9-1.3ubuntu0.1
---
lmbench (3.0-a9-1.3ubuntu0.1) zesty; urgency=medium
* d/p/dynamic-tcp-backlog.dpatch: Dynamically increase the TCP backlog on
high core-count systems. (LP: #1706735)
-- dann frazier Mon, 16 Oct 2017 15:37:03
Verified in zesty as well:
ubuntu@ubuntu:~$ /usr/lib/lmbench/bin/lat_select -P 110 tcp
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
c
Tested on xenial on ThunderX2:
shay@t99-1s-03:~
$ /usr/lib/lmbench/bin/lat_select -P 128 tcp
Select on 200 tcp fd's: 31.0622 microseconds
shay@t99-1s-03:~
$ apt-cache policy lmbench
lmbench:
Installed: 3.0-a9-1.1ubuntu0.1
Candidate: 3.0-a9-1.1ubuntu0.1
Version table:
*** 3.0-a9-1.1ubuntu0.1
Hello Shay, or anyone else affected,
Accepted lmbench into zesty-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/lmbench/3.0-a9-1.3ubuntu0.1 in a
few hours, and then in the -proposed repository.
Please help us by testing this new package. See
https:/
** Also affects: lmbench (Ubuntu Zesty)
Importance: Undecided
Status: New
** Also affects: lmbench (Ubuntu Xenial)
Importance: Undecided
Status: New
** Changed in: lmbench (Ubuntu Xenial)
Status: New => In Progress
** Changed in: lmbench (Ubuntu Xenial)
Assignee:
This bug was fixed in the package lmbench - 3.0-a9+debian.1-1
---
lmbench (3.0-a9+debian.1-1) unstable; urgency=medium
* Acknowledge NMUs, thanks Andreas!
* Use upstream tarball as orig.tar.gz. This appends a +debian.1 to the
upstream version to avoid conflicting with the prev
** Changed in: lmbench (Ubuntu)
Status: In Progress => Fix Committed
** Changed in: lmbench (Ubuntu)
Assignee: (unassigned) => dann frazier (dannf)
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Thanks. I can reproduce:
ubuntu@ubuntu:~$ /usr/lib/lmbench/bin/lat_select -P 128 tcp
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
connect: Connection timed out
con
** Changed in: lmbench (Ubuntu)
Status: Confirmed => In Progress
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https://bugs.launchpad.net/bugs/1706735
Title:
lmbench tcp lib backlog reservation too small, can cause hang.
T
** Changed in: lmbench (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1706735
Title:
lmbench tcp lib backlog reservation too small, can cause hang.
To
try lat_select -P 128 tcp
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Title:
lmbench tcp lib backlog reservation too small, can cause hang.
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@Shay: thanks. Do you happen to have a reproducer that just involves
running an lmbench subtest? I tried the following, but didn't observe a
hang:
Host A:
ubuntu@ubuntu:~$ /usr/lib/lmbench/bin/bw_tcp -s
Host B:
ubuntu@ubuntu:~$ /usr/lib/lmbench/bin/bw_tcp -P 224 2048M
0.065536 82.65 MB/sec
**
small change, to maintain the same behavior as prev with <100 cores:
int sock,np,backlog;
should be
int sock,np,backlog=100;
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Title:
lmbench tcp
** Tags added: cn99xx
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https://bugs.launchpad.net/bugs/1706735
Title:
lmbench tcp lib backlog reservation too small, can cause hang.
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