linux-kernel - Re: [patch] CFS scheduler, -v6

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Message-ID: <20070429080559.GB9988@elte.hu>
Date:	Sun, 29 Apr 2007 10:05:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kasper Sandberg <lkml@...anurb.dk>
Cc:	Willy Tarreau <w@....eu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Gene Heskett <gene.heskett@...il.com>,
	linux-kernel@...r.kernel.org, Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Mark Lord <lkml@....ca>, Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v6


* Kasper Sandberg <lkml@...anurb.dk> wrote:

> If you have some ideas on how these problems might be fixed i'd surely 
> try fixes and stuff, or if you have some data you need me to collect 
> to better understand whats going on. But i suspect any somewhat 
> demanding 3d application will do, and the difference is so staggering 
> that when you see it in effect, you cant miss it.

it would be great if you could try a simple experiment: does something 
as simple as glxgears resized to a large window trigger this 
'stuttering' phenomenon when other stuff is running? If not, could you 
try to find the simplest 3D stuff under Linux that already triggers it 
so that i can reproduce it?

(Also, as an independent debug-test, could you try CONFIG_PREEMPT too 
perhaps? I.e. is this 'stuttering' behavior independent of the 
preemption model and a general property of CFS?)

	Ingo
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