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SubjectRe: Performance loss 2.6.22->22.6.23->2.6.24-rc7 on CPU intensive benchmark on 8 Core Xeon
> 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!

> /sys/devices/system/cpu/sched_mc_power_savings
>
> does that change the results?
>

no measurable difference on this toggle that I can see.


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