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

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Message-ID: <4650774F.9040208@debianpt.org>
Date:	Sun, 20 May 2007 17:29:03 +0100
From:	Miguel Figueiredo <elmig@...ianpt.org>
To:	Bill Davidsen <davidsen@....com>
CC:	Linux Kernel M/L <linux-kernel@...r.kernel.org>
Subject: Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

Bill Davidsen wrote:
> I generated a table of results from the latest glitch1 script, using an 
> HTML postprocessor I not *quite* ready to foist on the word. In any case 
> it has some numbers for frames per second, fairness of the processor 
> time allocated to the compute bound processes which generate a lot of 
> other screen activity for X, and my subjective comments on how smooth it 
> looked and felt.
> 
> The chart is at http://www.tmr.com/~davidsen/sched_smooth_01.html for 
> your viewing pleasure. The only "tuned" result was with sd, since what I 
> observed was so bad using the default settings. If any scheduler 
> developers would like me to try other tunings or new versions let me know.
> 

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.

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...

-- 

Com os melhores cumprimentos/Best regards,

Miguel Figueiredo
http://www.DebianPT.org
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