On Wed, 2007-07-25 at 16:55 -0400, Chris Snook wrote:
> Chris Friesen wrote:
> > Ingo Molnar wrote:
> >
> >> the 3s is the problem: change that to 60s! We no way want to
> >> over-migrate for SMP fairness, the change i did gives us reasonable
> >> long-term SMP fairness without the need for high-rate rebalancing.
> >
> > Actually, I do have requirements from our engineering guys for
> > short-term fairness. They'd actually like decent fairness over even
> > shorter intervals...1 second would be nice, 2 is acceptable.
> >
> > They are willing to trade off random peak performance for predictability.
> >
> > Chris
> >
>
> The sysctls for CFS have nanosecond resolution. They default to
> millisecond-order values, but you can set them much lower. See sched_fair.c for
> the knobs and their explanations.
>
> -- Chris
This is incorrect. Those knobs control local-CPU fairness granularity
but have no control over fairness across CPUs.
I'll do some benchmarking as Ingo suggested.
tong
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