Messages in this thread Patch in this message | | | Date | Sat, 25 Oct 2008 20:55:01 -0700 (PDT) | Subject | Re: [tbench regression fixes]: digging out smelly deadmen. | From | David Miller <> |
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From: "Rafael J. Wysocki" <rjw@sisk.pl> Date: Sat, 25 Oct 2008 13:13:20 +0200
> Could you please give me a pointer to the commit disabling the hrtimer feature?
Here it is:
commit 0c4b83da58ec2e96ce9c44c211d6eac5f9dae478 Author: Ingo Molnar <mingo@elte.hu> Date: Mon Oct 20 14:27:43 2008 +0200
sched: disable the hrtick for now
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>
diff --git a/kernel/sched_features.h b/kernel/sched_features.h index 7c9e8f4..fda0162 100644 --- a/kernel/sched_features.h +++ b/kernel/sched_features.h @@ -5,7 +5,7 @@ SCHED_FEAT(START_DEBIT, 1) SCHED_FEAT(AFFINE_WAKEUPS, 1) SCHED_FEAT(CACHE_HOT_BUDDY, 1) SCHED_FEAT(SYNC_WAKEUPS, 1) -SCHED_FEAT(HRTICK, 1) +SCHED_FEAT(HRTICK, 0) SCHED_FEAT(DOUBLE_TICK, 0) SCHED_FEAT(ASYM_GRAN, 1) SCHED_FEAT(LB_BIAS, 1)
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