From: Mike Galbraith <efault@gmx.de>
To: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: hackbench regression with 2.6.26-rc2 on tulsa machine
Date: Wed, 21 May 2008 07:19:48 +0200 [thread overview]
Message-ID: <1211347188.4829.2.camel@marge.simson.net> (raw)
In-Reply-To: <1211345650.3177.247.camel@ymzhang>
On Wed, 2008-05-21 at 12:54 +0800, Zhang, Yanmin wrote:
> On Tue, 2008-05-20 at 11:22 +0200, Mike Galbraith wrote:
> > Do you still have group scheduling enabled?
> Yes.
> CONFIG_GROUP_SCHED=y
> CONFIG_FAIR_GROUP_SCHED=y
> # CONFIG_RT_GROUP_SCHED is not set
> CONFIG_USER_SCHED=y
> # CONFIG_CGROUP_SCHED is not set
>
> > If so, can you turn it off
> > and try again? (when in doubt, grasp at any straw within reach;)
> I reran the test for dozeons of times.
> 1) Background processes have impact on the result and cause result to fluctuate with 8~9 seconds;
> 2) After turning off most services (background processes), the result looks stable;
> 3) I tested both 2.6.26-rc1 and 2.6.26-rc2 with CONFIG_GROUP_SCHED=n. the first one's result
> is about 30 seconds and the second one's result is about 31 seconds. So CONFIG_GROUP_SCHED is the key.
Thanks a bunch for re-testing.
-Mike
prev parent reply other threads:[~2008-05-21 5:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-05-20 8:09 hackbench regression with 2.6.26-rc2 on tulsa machine Zhang, Yanmin
2008-05-20 9:22 ` Mike Galbraith
2008-05-21 4:54 ` Zhang, Yanmin
2008-05-21 5:19 ` Mike Galbraith [this message]
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