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Date: Sun, 29 Apr 2007 10:05:59 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Kasper Sandberg <lkml@metanurb.dk>
Cc: Willy Tarreau <w@1wt.eu>, Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       Gene Heskett <gene.heskett@gmail.com>, linux-kernel@vger.kernel.org,
       Con Kolivas <kernel@kolivas.org>, Nick Piggin <npiggin@suse.de>,
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       Peter Williams <pwil3058@bigpond.net.au>,
       Thomas Gleixner <tglx@linutronix.de>, caglar@pardus.org.tr,
       Mark Lord <lkml@rtr.ca>, Zach Carter <linux@zachcarter.com>,
       buddabrod <buddabrod@gmail.com>
Subject: Re: [patch] CFS scheduler, -v6
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* Kasper Sandberg <lkml@metanurb.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