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sched: disable the hrtick for now

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David Miller reported that hrtick update overhead has tripled the
wakeup overhead on Sparc64.

That is too much - disable the HRTICK feature for now by default,
until a faster implementation is found.

Reported-by: David Miller <davem@davemloft.net>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-10-20 14:27:43 +02:00
parent f9c0b0950d
commit 0c4b83da58
1 changed files with 1 additions and 1 deletions
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2
kernel/sched_features.h
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@ -5,7 +5,7 @@ SCHED_FEAT(START_DEBIT, 1)
SCHED_FEAT(AFFINE_WAKEUPS, 1) SCHED_FEAT(AFFINE_WAKEUPS, 1)
SCHED_FEAT(CACHE_HOT_BUDDY, 1) SCHED_FEAT(CACHE_HOT_BUDDY, 1)
SCHED_FEAT(SYNC_WAKEUPS, 1) SCHED_FEAT(SYNC_WAKEUPS, 1)
SCHED_FEAT(HRTICK, 1) SCHED_FEAT(HRTICK, 0)
SCHED_FEAT(DOUBLE_TICK, 0) SCHED_FEAT(DOUBLE_TICK, 0)
SCHED_FEAT(ASYM_GRAN, 1) SCHED_FEAT(ASYM_GRAN, 1)
SCHED_FEAT(LB_BIAS, 1) SCHED_FEAT(LB_BIAS, 1)