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

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Date:	Mon, 30 Jul 2007 17:24:27 -0400
From:	Kenneth Prugh <ken69267@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
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)

Ingo Molnar wrote:
> * Kenneth Prugh <ken69267@...il.com> wrote:
> 
>> Ingo Molnar wrote:
>>> <large snip>
>> Hello, I have a gaming rig and would love to help benchmark with my 
>> copy of UT2004(E6600 Core2 and a 7950GTO card). Or if you have 
>> anything else that would better serve as a benchmark I could grab it 
>> and try.
>>
>> The only problem is I don't know what 2 kernels I should be using to 
>> test the schedulers. I assume 2.6.23-rc1 for CFS, but what about SD?
> 
> .22-ck1 includes it, so that should be fine:
> 
>  http://ussg.iu.edu/hypermail/linux/kernel/0707.1/0318.html
> 
> 	Ingo
> 

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.

		CFS		|		SD
UT2004 + 0 loops | 200 FPS		UT2004 + 0 loops | 190 FPS
UT2004 + 1 loops | 195 FPS		UT2004 + 1 loops | 190 FPS
UT2004 + 2 loops | 190 FPS		UT2004 + 2 loops | 190 FPS
UT2004 + 3 loops | 189 FPS		UT2004 + 3 loops | 136 FPS
UT2004 + 4 loops | 150 FPS		UT2004 + 4 loops | 137 FPS
UT2004 + 5 loops | 145 FPS		UT2004 + 5 loops | 136 FPS
UT2004 + 6 loops | 145 FPS		UT2004 + 6 loops | 105 FPS
UT2004 + 7 loops | 118 FPS		UT2004 + 7 loops | 104 FPS
UT2004 + 8 loops | 97 FPS		UT2004 + 8 loops | 104 FPS
UT2004 + 9 loops | 94 FPS		UT2004 + 9 loops | 89 FPS
UT2004 + 10 loops | 92 FPS		UT2004 + 10 loops | 91 FPS

-- 
Kenneth Prugh


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