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

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Message-ID: <469512C1.6090406@tmr.com>
Date:	Wed, 11 Jul 2007 13:26:25 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Mike Galbraith <efault@....de>
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

Mike Galbraith wrote:
> Greetings,
> 
> On Fri, 2007-07-06 at 19:33 +0200, Ingo Molnar wrote:
>> i'm pleased to announce release -v19 of the CFS scheduler patchset.
> 
> I've taken mainline git tree (freshly integrated CFS!) out for a
> multimedia spin.  I tested watching movies and listenign to music in the
> presence of various sleep/burn loads, pure burn loads, and mixed loads.
> All was peachy here.. I saw no frame drops or sound skips or other
> artifacts under any load where the processor could possibly meet demand.
> 
I would agree with preliminary testing, save that if you get a lot of 
processes updating the screen at once, there seems to be a notable case 
of processes getting no CPU for 100-300ms, followed by a lot of CPU.

I see this clearly with the "glitch1" test with four scrolling xterms 
and glxgears, but also watching videos with little busy processes on the 
screen. The only version where I never see this in test or with real use 
is cfs-v13.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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