Re: [tbench regression fixes]: digging out smelly deadmen.

[David Miller]

From: "Rafael J. Wysocki" <rjw@xxxxxxx>
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@xxxxxxx>
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@xxxxxxxxxxxxx>
    Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
    Signed-off-by: Ingo Molnar <mingo@xxxxxxx>

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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