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SubjectRe: [PATCH 2.5.53] NUMA scheduler (1/3)
Date
Hi Michael and Martin,

thanks a lot for the testing!

I rechecked the changes and really don't see any reason for a
slowdown. Michael's measurements seem to confirm that this is just a
statistical effect. I suggest: when in doubt, do 10 kernel compiles
instead of 5. A simple statistical error estimation as I did for
schedbench might help, too. Guess I've sent you the script a while
ago.

I understand from your emails that the 2.5.53 patches apply and work
for 2.5.54, therefore I'll wait for 2.5.55 with a rediff.

Regards,
Erich


On Tuesday 07 January 2003 03:23, Michael Hohnbaum wrote:
> On Sun, 2003-01-05 at 22:07, Martin J. Bligh wrote:
> > >> > Kernbench:
> > >> > Elapsed User System CPU
> > >> > sched50 29.96s 288.308s 83.606s 1240.8%
> > >> > sched52 29.836s 285.832s 84.464s 1240.4%
> > >> > sched53 29.364s 284.808s 83.174s 1252.6%
> > >> > stock50 31.074s 303.664s 89.194s 1264.2%
> > >> > stock53 31.204s 306.224s 87.776s 1263.2%
> > >
> > > sched50 = linux 2.5.50 with the NUMA scheduler
> > > sched52 = linux 2.5.52 with the NUMA scheduler
> > > sched53 = linux 2.5.53 with the NUMA scheduler
> > > stock50 = linux 2.5.50 without the NUMA scheduler
> > > stock53 = linux 2.5.53 without the NUMA scheduler
> >
> > I was doing a slightly different test - Erich's old sched code vs the new
> > both on 2.5.54, and seem to have a degredation.
> >
> > M.
>
> Martin,
>
> I ran 2.5.54 with an older version of Erich's NUMA scheduler and
> with the version sent out for 2.5.53. Results were similar:
>
> Kernbench:
> Elapsed User System CPU
> sched54 29.112s 283.888s 82.84s 1259.4%
> oldsched54 29.436s 286.942s 82.722s 1256.2%
>
> sched54 = linux 2.5.54 with the 2.5.53 version of the NUMA scheduler
> oldsched54 = linux 2.5.54 with an earlier version of the NUMA scheduler
>
> The numbers for the new version are actually a touch better, but
> close enough to be within a reasonable margin of error.
>
> I'll post numbers against stock 2.5.54 and include schedbench, tomorrow.
>
> Michael

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