linux-kernel - Re: CFS review

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Date:	Tue, 21 Aug 2007 09:33:03 +0200
From:	Mike Galbraith <efault@....de>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Willy Tarreau <w@....eu>,
	Michael Chang <thenewme91@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: CFS review

On Tue, 2007-08-21 at 00:19 +0200, Roman Zippel wrote: 
> Hi,
> 
> On Sat, 11 Aug 2007, Ingo Molnar wrote:
> 
> > the only relevant thing that comes to mind at the moment is that last 
> > week Peter noticed a buggy aspect of sleeper bonuses (in that we do not 
> > rate-limit their output, hence we 'waste' them instead of redistributing 
> > them), and i've got the small patch below in my queue to fix that - 
> > could you give it a try?
> 
> It doesn't make much of a difference.

I thought this was history.  With your config, I was finally able to
reproduce the anomaly (only with your proggy though), and Ingo's patch
does indeed fix it here.

Freshly reproduced anomaly and patch verification, running 2.6.23-rc3
with your config, both with and without Ingo's patch reverted:

6561 root      20   0  1696  492  404 S 32.0  0.0   0:30.83 0 lt
6562 root      20   0  1696  336  248 R 32.0  0.0   0:30.79 0 lt
6563 root      20   0  1696  336  248 R 32.0  0.0   0:30.80 0 lt
6564 root      20   0  2888 1236 1028 R  4.6  0.1   0:05.26 0 sh

6507 root      20   0  2888 1236 1028 R 25.8  0.1   0:30.75 0 sh
6504 root      20   0  1696  492  404 R 24.4  0.0   0:29.26 0 lt
6505 root      20   0  1696  336  248 R 24.4  0.0   0:29.26 0 lt
6506 root      20   0  1696  336  248 R 24.4  0.0   0:29.25 0 lt

	-Mike

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