Re: Sched - graphic smoothness under load - cfs-v13 sd-0.48

Miguel Figueiredo
2007-05-20T16:59:04Z

Ray Lee wrote:
> On 5/20/07, Miguel Figueiredo <elmig@debianpt.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