linux-kernel - Re: [patch] CFS scheduler, -v19

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Date:	Sun, 15 Jul 2007 07:25:33 +0200
From:	Mike Galbraith <efault@....de>
To:	Ed Tomlinson <edt@....ca>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>
Subject: Re: [patch] CFS scheduler, -v19

On Sat, 2007-07-14 at 13:19 -0400, Ed Tomlinson wrote:
> Hi,

Hi Ed,

> I run a java application at nice 15.  Its been a background application here for as long
> as SD and CFS have been around.  If I have a compile running at nice 0, with v19 java 
> gets so little cpu that the the wrapper that runs to monitor it is timing out waiting for 
> it to start.  This is new in v19 - something in v19 is not meshing well with my mix 
> of applications...
> 
> Kernel is gentoo 2.6.22-r1 + cfs v19
> 
> How can I help to debug this?

I hear Ingo is off having a genuine long weekend, but in the meantime,
you could try echo 30 > /proc/sys/kernel/sched_features to eliminate the
sleeper fairness changes in v19, since that was the biggest change.

Sending a few seconds of logged /proc/sched_debug will also help get a
picture of what's happening, and lovely would be a method to reproduce
the problem locally.

	-Mike

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