linux-kernel - Re: hackbench regression with 2.6.26-rc2 on tulsa machine

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Message-Id: <1211347188.4829.2.camel@marge.simson.net>
Date:	Wed, 21 May 2008 07:19:48 +0200
From:	Mike Galbraith <efault@....de>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: hackbench regression with 2.6.26-rc2 on tulsa machine


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

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