| 2012-09-27 15:35:50 |
Chris J Arges |
bug |
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added bug |
| 2012-09-27 15:36:05 |
Chris J Arges |
nominated for series |
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Ubuntu Precise |
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| 2012-09-27 15:36:05 |
Chris J Arges |
bug task added |
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linux (Ubuntu Precise) |
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| 2012-09-27 16:37:50 |
Chris J Arges |
attachment added |
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lp1057593 precise backport fix https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1057593/+attachment/3348881/+files/0001-sched-Fix-migration-thread-runtime-bogosity.patch |
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| 2012-09-27 16:39:05 |
Chris J Arges |
linux (Ubuntu Precise): assignee |
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Chris J Arges (christopherarges) |
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| 2012-09-27 16:39:06 |
Chris J Arges |
linux (Ubuntu Precise): importance |
Undecided |
High |
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| 2012-09-27 16:39:08 |
Chris J Arges |
linux (Ubuntu Precise): status |
New |
Confirmed |
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| 2012-09-27 16:39:50 |
Chris J Arges |
attachment added |
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lp1057593 quantal backport fix https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1057593/+attachment/3348890/+files/0001-sched-Fix-migration-thread-runtime-bogosity.patch |
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| 2012-09-27 16:45:55 |
Chris J Arges |
description |
When running a workload that frequently migrates threads, when cpu usage shows bogus values.
This is present in 12.04, but not present in 10.10.
It is expected that when running this workload the cpu usage would be reported correctly.
One can verify this by running:
ps ax -opid,comm,pcpu|grep migration | sort -k3 -rn |
When running a workload that frequently migrates threads, when cpu usage shows bogus values.
This is present in 12.04, but not present in 10.10.
It is expected that when running this workload the cpu usage would be reported correctly.
One can verify this by running:
ps ax -opid,comm,pcpu|grep migration | sort -k3 -rn
Here is more information about this issue:
http://lwn.net/Articles/473172/ |
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| 2012-09-27 16:46:24 |
Chris J Arges |
nominated for series |
|
Ubuntu Quantal |
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| 2012-09-27 16:46:24 |
Chris J Arges |
bug task added |
|
linux (Ubuntu Quantal) |
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| 2012-09-27 16:50:56 |
Chris J Arges |
description |
When running a workload that frequently migrates threads, when cpu usage shows bogus values.
This is present in 12.04, but not present in 10.10.
It is expected that when running this workload the cpu usage would be reported correctly.
One can verify this by running:
ps ax -opid,comm,pcpu|grep migration | sort -k3 -rn
Here is more information about this issue:
http://lwn.net/Articles/473172/ |
SRU Justification:
Impact:
When running a workload that frequently migrates threads, when cpu usage shows bogus values.
This is present in 12.04, but not present in 10.10.
It is expected that when running this workload the cpu usage would be reported correctly.
One can verify this by running:
ps ax -opid,comm,pcpu|grep migration | sort -k3 -rn
Here is more information about this issue:
http://lwn.net/Articles/473172/
Fix:
This fix is present in upstream linux with commit:
8f6189684eb4e85e6c593cd710693f09c944450a
Testcase:
Run a workload that frequently migrates threads, then show cpu usage. With this patch it should show proper usage. |
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| 2012-09-27 20:19:56 |
Ubuntu Foundations Team Bug Bot |
tags |
|
patch |
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| 2012-09-27 20:20:54 |
Ubuntu Foundations Team Bug Bot |
bug |
|
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added subscriber Ubuntu Review Team |
| 2012-09-28 19:44:53 |
Tim Gardner |
linux (Ubuntu Quantal): status |
Confirmed |
Fix Committed |
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| 2012-09-28 19:44:57 |
Tim Gardner |
linux (Ubuntu Precise): status |
Confirmed |
In Progress |
|
| 2012-09-29 08:56:36 |
Launchpad Janitor |
linux (Ubuntu Quantal): status |
Fix Committed |
Fix Released |
|
| 2012-10-01 19:02:15 |
Tim Gardner |
linux (Ubuntu Precise): status |
In Progress |
Fix Committed |
|
| 2012-10-04 00:13:45 |
Launchpad Janitor |
branch linked |
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lp:ubuntu/quantal-proposed/linux-lowlatency |
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| 2012-10-09 23:40:44 |
Launchpad Janitor |
branch linked |
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lp:ubuntu/quantal-proposed/linux-ti-omap4 |
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| 2012-10-15 20:25:28 |
Chris J Arges |
bug |
|
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added subscriber Sustaining Engineering |
| 2012-10-22 11:16:48 |
Luis Henriques |
tags |
patch |
patch verification-needed-precise |
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| 2012-10-25 00:12:30 |
Launchpad Janitor |
branch linked |
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lp:ubuntu/precise-proposed/linux-ti-omap4 |
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| 2012-10-30 13:03:45 |
Luis Henriques |
tags |
patch verification-needed-precise |
patch verification-done-precise |
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| 2012-11-14 20:21:12 |
Launchpad Janitor |
linux (Ubuntu Precise): status |
Fix Committed |
Fix Released |
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| 2012-11-14 21:30:44 |
Launchpad Janitor |
branch linked |
|
lp:ubuntu/precise-proposed/linux-lowlatency |
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| 2012-11-28 00:22:58 |
Adam Jacob Muller |
bug |
|
|
added subscriber Adam Jacob Muller |
| 2014-02-07 15:46:52 |
Curtis Hovey |
removed subscriber Registry Administrators |
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