linux-kernel - Re: Sched - graphic smoothness under load

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Date:	Sun, 20 May 2007 17:58:05 +0100
From:	Miguel Figueiredo <elmig@...ianpt.org>
To:	Ray Lee <ray-lk@...rabbit.org>
CC:	Bill Davidsen <davidsen@....com>,
	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

Ray Lee wrote:
> On 5/20/07, Miguel Figueiredo <elmig@...ianpt.org> wrote:
>> As I tryied myself kernels 2.6.21, 2.6.21-cfs-v13, and 2.6.21-ck2 on the
>> same machine i found *very* odd those numbers you posted, so i tested
>> myself those kernels to see the numbers I get instead of talking about
>> the usage of kernel xpto feels like.
>>
>> I did run glxgears with kernels 2.6.21, 2.6.21-cfs-v13 and 2.6.21-ck2
>> inside Debian's GNOME environment. The hardware is an AMD Sempron64 3.0
>> GHz, 1 GB RAM, Nvidia 6800XT.
>> Average and standard deviation from the gathered data:
>>
>> * 2.6.21:               average = 11251.1; stdev = 0.172
>> * 2.6.21-cfs-v13:       average = 11242.8; stdev = 0.033
>> * 2.6.21-ck2:           average = 11257.8; stdev = 0.067
>>
>> Keep in mind those numbers don't mean anything we all know glxgears is
>> not a benchmark, their purpose is only to be used as comparison under
>> the same conditions.
> 
> Uhm, then why are you trying to use them to compare against Bill's
> numbers? You two have completely different hardware setups, and this
> is a test that is dependent upon hardware. Stated differently, this is
> a worthless comparison between your results and his as you are
> changing multiple variables at the same time. (At minimum: the
> scheduler, cpu, and video card.)

The only thing i want to see it's the difference between the behaviour 
of the different schedulers on the same test setup. In my test -ck2 was 
a bit better, not 200% worse as in Bill's measurements. I don't compare 
absolute values on different test setups.

> 
>> One odd thing i noticed, with 2.6.21-cfs-v13 the gnome's time applet in
>> the bar skipped some minutes (e.g. 16:23 -> 16:25) several times.
>>
>> The data is available on:
>> http://www.debianPT.org/~elmig/pool/kernel/20070520/
>>
>>
>> How did you get your data? I am affraid your data it's wrong, there's no
>>   such big difference between the schedulers...
> 
> It doesn't look like you were running his glitch1 script which starts
> several in glxgears parallel. Were you, or were you just running one?

No i'm not, i'm running only one instance of glxgears inside the GNOME's 
environment.


-- 

Com os melhores cumprimentos/Best regards,

Miguel Figueiredo
http://www.DebianPT.org
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