linux-kernel - Re: [git] CFS-devel, group scheduler, fixes

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Message-Id: <1190264114.6411.4.camel@Homer.simpson.net>
Date:	Thu, 20 Sep 2007 06:55:14 +0200
From:	Mike Galbraith <efault@....de>
To:	Tong Li <tong.n.li@...el.com>
Cc:	Ingo Molnar <mingo@...e.hu>, dimm <dmitry.adamushko@...il.com>,
	linux-kernel@...r.kernel.org,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [git] CFS-devel, group scheduler, fixes

On Wed, 2007-09-19 at 10:06 -0700, Tong Li wrote:

> Were the experiments run on a 2-CPU system?

Yes.

>  When Xorg experiences large 
> wait time, is it on the same CPU that has the two pinned tasks? If this is 
> the case, then the problem could be X somehow advanced faster and got a 
> larger vruntime then the two pinned tasks, so it had to wait for the 
> pinned ones to catch up before it got a chance to be scheduled.

Good question.  I've not yet been able to capture any event where
vruntimes are that far apart in sched_debug.

	-Mike

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