From: Peter Zijlstra <a.p.zijlstra@chello.nl>
To: Holger.Wolf@de.ibm.com
Cc: mingo@elte.hu, schwidefsky@de.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: Scheduler behaviour
Date: Wed, 05 Dec 2007 22:15:02 +0100 [thread overview]
Message-ID: <1196889302.6353.29.camel@lappy> (raw)
In-Reply-To: <475706E2.50805@linux.vnet.ibm.com>
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.
next prev parent reply other threads:[~2007-12-05 21:16 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-05 20:15 Scheduler behaviour Holger Wolf
2007-12-05 21:15 ` Peter Zijlstra [this message]
2007-12-05 21:21 ` Ingo Molnar
2007-12-05 21:26 ` Arjan van de Ven
2007-12-06 21:53 ` Jarek Poplawski
2007-12-07 16:29 ` Holger Wolf
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