* Colin Fowler <[EMAIL PROTECTED]> wrote:
> > there are a handful of 'scheduler feature bits' in
> > /proc/sys/kernel/sched_features:
> >
> > enum {
> > SCHED_FEAT_NEW_FAIR_SLEEPERS = 1,
> > SCHED_FEAT_WAKEUP_PREEMPT = 2,
> > SCHED_FEAT_START_DEBIT = 4,
> > SCHED_FEAT_TREE_AVG = 8,
> > SCHED_FEAT_APPROX_AVG = 16,
> > };
> >
>
> Toggling SCHED_FEAT_NEW_FAIR_SLEEPERS to 0 or
> SCHED_FEAT_WAKEUP_PREEMPT to 0 gives me results more inline with my
> 2.6.22 results. Toggling them both to 0 gives me slightly better
> results than 2.6.22!
ok, but it would be nice to avoid having to turn these off. Could you
try whether tuning the /proc/sys/kernel/*granularity* values (in
particular wakeup_granularity) has any positive effect on your workload?
also, could you run your workload as SCHED_BATCH [via schedtool -B ],
does that improve the results as well on a default-tuned kernel?
Ingo
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