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Date:	Wed, 05 Dec 2007 22:15:02 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Holger.Wolf@...ibm.com
Cc:	mingo@...e.hu, schwidefsky@...ibm.com, linux-kernel@...r.kernel.org
Subject: Re: Scheduler behaviour


On Wed, 2007-12-05 at 21:15 +0100, Holger Wolf wrote:

> We discovered performance degradation with dbench when using kernel 2.6.23 compared to kernel 2.6.22.

We've fixed a lot of regressions and made a lot of other changes to the
scheduler since .23. Could you please try the backport of the latest
scheduler on top of .23 to see if any of our recent work solved your
problem? (using a backport against .23 or even .22 allows you to test
just the scheduler changes in isolation)

http://people.redhat.com/mingo/cfs-scheduler/sched-cfs-v2.6.22.13-v24.patch
http://people.redhat.com/mingo/cfs-scheduler/sched-cfs-v2.6.23.9-v24.patch

Also, it could be dbench is one of those benchmarks that favours
unfairness, I seem to remember so.. still we should not regress too much
without a very good reason.



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