linux-kernel - [RFC PATCH v4 7/7] sched: fine-tune SD_MC

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Message-ID: <20081121083154.27075.71015.stgit@drishya.in.ibm.com>
Date:	Fri, 21 Nov 2008 14:01:54 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Suresh B Siddha <suresh.b.siddha@...el.com>,
	Venkatesh Pallipadi <venkatesh.pallipadi@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Dipankar Sarma <dipankar@...ibm.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Vatsa <vatsa@...ux.vnet.ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Collier-Brown <davecb@....com>,
	Tim Connors <tconnors@...ro.swin.edu.au>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Gregory Haskins <gregory.haskins@...il.com>,
	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
Subject: [RFC PATCH v4 7/7] sched: fine-tune SD_MC_INIT -- revert

commit 14800984706bf6936bbec5187f736e928be5c218
    Author: Mike Galbraith <efault@....de>
    Date:   Fri Nov 7 15:26:50 2008 +0100

    Reverting this patch for now since this affects
    consolidation and power savings.  Will rework
    this tuning in the next iteration.

    Tune SD_MC_INIT the same way as SD_CPU_INIT:
    unset SD_BALANCE_NEWIDLE, and set SD_WAKE_BALANCE.

    This improves vmark by 5%:

    vmark         132102 125968 125497 messages/sec    avg 127855.66    .984
    vmark         139404 131719 131272 messages/sec    avg 134131.66   1.033

    Signed-off-by: Mike Galbraith <efault@....de>
    Acked-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
    Signed-off-by: Ingo Molnar <mingo@...e.hu>

    Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
---

 include/linux/topology.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/include/linux/topology.h b/include/linux/topology.h
index 2565f4a..b1551d4 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -120,10 +120,10 @@ void arch_update_cpu_topology(void);
 	.wake_idx		= 1,			\
 	.forkexec_idx		= 1,			\
 	.flags			= SD_LOAD_BALANCE	\
+				| SD_BALANCE_NEWIDLE	\
 				| SD_BALANCE_FORK	\
 				| SD_BALANCE_EXEC	\
 				| SD_WAKE_AFFINE	\
-				| SD_WAKE_BALANCE	\
 				| SD_SHARE_PKG_RESOURCES\
 				| BALANCE_FOR_MC_POWER,	\
 	.last_balance		= jiffies,		\

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