linux-kernel - Re: [ck] Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)

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Message-ID: <20070731094526.GA16300@elte.hu>
Date:	Tue, 31 Jul 2007 11:45:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kenneth Prugh <ken69267@...il.com>
Cc:	John <darknessenvelops@...il.com>, ck@....kolivas.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kasper Sandberg <lkml@...anurb.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [ck] Re: SD still better than CFS for 3d ?(was Re: 2.6.23-rc1)


* Kenneth Prugh <ken69267@...il.com> wrote:

> Alright, Just got done with some testing of UT2004 between 2.6.23-rc1 
> CFS and 2.6.22-ck1 SD. This series of tests was run by spawning in a 
> map while not moving at all and always facing the same direction, 
> while slowing increasing the number of loops.
> 
> CFS generally seemed a lot smoother as the load increased, while SD 
> broke down to a highly unstable fps count that fluctuated massively 
> around the third loop. Seems like I will stick to CFS for gaming now.
> 
> Below you will find the results of my test with the average number of 
> FPS.

Thanks Kenneth for the testing! I've created a graph out of your 
numbers:

  http://people.redhat.com/mingo/misc/cfs-sd-ut2004-perf.jpg

(it also includes the SD numbers you got with the turn-yield-into-NOP 
hack applied.)

	Ingo
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