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SubjectRe: tbench regression with 2.6.33-rc1
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On Tue, 2009-12-29 at 13:24 +0800, Mike Galbraith wrote:
> On Tue, 2009-12-29 at 10:09 +0800, Lin Ming wrote:
> > And also no regression if I run tbench with RT scheduler on tulsa
> > machine, as below command,
> >
> > schedtool -R -p 20 -e tbench_srv &
> > schedtool -R -p 20 -e tbench 32
>
> Hm, odd. I'd expect tbench to suffer when run SCHED_RR, and here it
> does, achieving roughly 85% of lowest SCHED_OTHER throughput.

Here is some misunderstanding.
I compared SCHED_RR tbench with 2.6.32 and 2.6.33-rc1 and no regression
found.

For the same kernel, SCHED_RR tbench only achieved ~40% of SCHED_OTHER
throughput.

Lin Ming



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