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Old 03-05-2010, 05:48 AM
Yingying Zhao
 
Default fix performance regression for SMT and MC

There're two patches need to get backported to Lucid which address scheduler
regression for SMT and MC.

Both of them are in mainline now and also copied to stable tree:

SMT fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9000f05c6d1607f79c0deacf42b0969 3be673f4c
commit 9000f05c6d1607f79c0deacf42b09693be673f4c
Author: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Fri Feb 12 17:14:22 2010 -0800

sched: Fix SMT scheduler regression in find_busiest_queue()

MC fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dd5feea14a7de4edbd9f36db1a2db78 5de91b88d
commit dd5feea14a7de4edbd9f36db1a2db785de91b88d
Author: Suresh Siddha <suresh.b.siddha@intel.com>
Date: Tue Feb 23 16:13:52 2010 -0800

sched: Fix SCHED_MC regression caused by change in sched cpu_power

These patches are critical for SMT and MC performance, please consider to pick
up for Lucid.

Thanks
Yingying


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Old 03-05-2010, 01:07 PM
Tim Gardner
 
Default fix performance regression for SMT and MC

On 03/04/2010 11:48 PM, Yingying Zhao wrote:
> There're two patches need to get backported to Lucid which address scheduler
> regression for SMT and MC.
>
> Both of them are in mainline now and also copied to stable tree:
>
> SMT fix:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9000f05c6d1607f79c0deacf42b0969 3be673f4c
> commit 9000f05c6d1607f79c0deacf42b09693be673f4c
> Author: Suresh Siddha<suresh.b.siddha@intel.com>
> Date: Fri Feb 12 17:14:22 2010 -0800
>
> sched: Fix SMT scheduler regression in find_busiest_queue()
>
> MC fix:
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=dd5feea14a7de4edbd9f36db1a2db78 5de91b88d
> commit dd5feea14a7de4edbd9f36db1a2db785de91b88d
> Author: Suresh Siddha<suresh.b.siddha@intel.com>
> Date: Tue Feb 23 16:13:52 2010 -0800
>
> sched: Fix SCHED_MC regression caused by change in sched cpu_power
>
> These patches are critical for SMT and MC performance, please consider to pick
> up for Lucid.
>
> Thanks
> Yingying
>
>

Yingying - the first patch 'sched: Fix SMT scheduler regression in
find_busiest_queue()' applies cleanly and ought to show up in stable
pretty soon, but the second patch appears to have some prerequisite
commits. Can you have Suresh research the minimum set required in order
to apply 'sched: Fix SCHED_MC regression caused by change in sched
cpu_power' ?

rtg
--
Tim Gardner tim.gardner@canonical.com

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