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

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Message-Id: <20081025.205501.193695937.davem@davemloft.net>
Date:	Sat, 25 Oct 2008 20:55:01 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	rjw@...k.pl
Cc:	mingo@...e.hu, s0mbre@...rvice.net.ru, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org, efault@....de
Subject: Re: [tbench regression fixes]: digging out smelly deadmen.

From: "Rafael J. Wysocki" <rjw@...k.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@...e.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@...emloft.net>
    Acked-by: Peter Zijlstra <peterz@...radead.org>
    Signed-off-by: Ingo Molnar <mingo@...e.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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