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

Ray Lee
2007-05-20T16:44:45Z

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.)

> 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?