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SubjectRE: question on sched-rt group allocation cap: sched_rt_runtime_us
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On Sun, 2009-09-06 at 17:18 -0700, Anirban Sinha wrote:
>
>
> > Dunno. Fly or die little patchlet (toss).
>
> > sched: allow the user to disable RT bandwidth aggregation.
>
> Hmm. Interesting. With this change, my results are as follows:
>
> rt_runtime/rt_period % of reg iterations
>
> 0.2 100%
> 0.25 100%
> 0.3 100%
> 0.4 100%
> 0.5 82%
> 0.6 66%
> 0.7 54%
> 0.8 46%
> 0.9 38.5%
> 0.95 32%
>
>
> This results are on a quad core blade. Does it still makes sense
> though?
> Can anyone else run the same tests on a quadcore over the latest
> kernel? I will patch our 2.6.26 kernel with upstream fixes and rerun
> these tests on tuesday.

I tested tip (v2.6.31-rc9-1357-ge6a3cd0) with a little perturbation
measurement proglet on an isolated Q6600 core.

10s measurement interval results:

sched_rt_runtime_us RT utilization
950000 94.99%
750000 75.00%
500000 50.04%
250000 25.02%
50000 5.03%
Seems to work fine here.

-Mike



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