linux-kernel - 3d smoothness (was: Re: [patch] CFS scheduler, -v6)

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Date:	Mon, 30 Apr 2007 19:45:32 +0200
From:	Kasper Sandberg <lkml@...anurb.dk>
To:	Ingo Molnar <mingo@...e.hu>
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: 3d smoothness (was: Re: [patch] CFS scheduler, -v6)

On Sunday 29 April 2007 19:39, Ingo Molnar wrote:
> hi Kasper,
>
> i found an aspect of CFS that could cause the kind of 'stuttering' you
> described in such detail. I'm wondering whether you could try the
> attached -v8-rc1 patch ontop of the -v7 CFS patch - does it improve the
> 'games FPS' situation in any way? Thanks in advance,
>
> 	Ingo

This patch makes things much worse, i'd categorize it as severe regression
compared to cfs 7. It makes the cursor in X stutter enormously, it even 
caused my entire X to lock up for a second, and events like keyboard input is 
totally wrecked, it lagged as i wrote in xchat. as for under load, it seems 
only worse..

Also if i just press a link in konqueror on some website, while it loads, the 
mouse is stuttering untill the page has loaded finished.

this seems weird because its such a relatively simple patch.

In the patchs defense, gtk seems to redraw faster (when, and only when 3d is 
NOT running)

i also discovered another thing about cfs 7 (without this patch), which is 
same behavior as old staircase/vanilla, but which SD actually fixes.

this is a wine case, where when it loads a level in world of warcraft, the 
audio skips. I believe this to be a problem in wine, however, in sd it 
actually does not skip. On the desktop however, the audio issues were totally 
fixed in v7..

mvh.
Kasper Sandberg
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