Messages in this thread | | | Subject | RE: question on sched-rt group allocation cap: sched_rt_runtime_us | From | Mike Galbraith <> | Date | Mon, 07 Sep 2009 08:54:46 +0200 |
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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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