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SubjectRe: BFS vs. mainline scheduler benchmarks and measurements

* Jens Axboe <jens.axboe@oracle.com> wrote:

> On Mon, Sep 07 2009, Jens Axboe wrote:
> > Scheduler Runtime Max lat Avg lat Std dev
> > ----------------------------------------------------------------
> > CFS 100 951 462 267
> > CFS-x2 100 983 484 308
> > BFS
> > BFS-x2
>
> Those numbers are buggy, btw, it's not nearly as bad. But
> responsiveness under compile load IS bad though, the test app just
> didn't quantify it correctly. I'll see if I can get it working
> properly.

What's the default latency target on your box:

cat /proc/sys/kernel/sched_latency_ns

?

And yes, it would be wonderful to get a test-app from you that would
express the kind of pain you are seeing during compile jobs.

Ingo


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