Re: VolanoMark regression with 2.6.27-rc1

[Ingo Molnar <mingo@elte.hu>]

* Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> And I must admit to having overlooked the effect on wake_affine..
> 
> Chris, could you see the effect of this on smp group fairness?

applied your commit below to tip/sched/urgent, thanks.

	Ingo

-------------->
>From 939387c3a6141ec6aefc7acd40f8b186781bb098 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Wed, 20 Aug 2008 12:44:55 +0200
Subject: [PATCH] sched: enable LB_BIAS by default

Yanmin reported a significant regression on his 16-core machine due to:

  commit 93b75217df39e6d75889cc6f8050343286aff4a5
  Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
  Date:   Fri Jun 27 13:41:33 2008 +0200

Flip back to the old behaviour.

Reported-by: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 kernel/sched_features.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 862b06b..9353ca7 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -8,6 +8,6 @@ SCHED_FEAT(SYNC_WAKEUPS, 1)
 SCHED_FEAT(HRTICK, 1)
 SCHED_FEAT(DOUBLE_TICK, 0)
 SCHED_FEAT(ASYM_GRAN, 1)
-SCHED_FEAT(LB_BIAS, 0)
+SCHED_FEAT(LB_BIAS, 1)
 SCHED_FEAT(LB_WAKEUP_UPDATE, 1)
 SCHED_FEAT(ASYM_EFF_LOAD, 1)