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Commit 799e2205 authored Oct 09, 2009 by Peter Zijlstra Committed by Ingo Molnar Oct 14, 2009

sched: Disable SD_PREFER_LOCAL for MC/CPU domains



Yanmin reported that both tbench and hackbench were significantly
hurt by trying to keep tasks local on these domains, esp on small
cache machines.

So disable it in order to promote spreading outside of the cache
domains.

Reported-by: "Zhang, Yanmin" <yanmin_zhang@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1255083400.8802.15.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent e17b38bf

arch/x86/include/asm/topology.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -143,6 +143,7 @@ extern unsigned long node_remap_size[];
		\| 1*SD_BALANCE_FORK \
		\| 0*SD_BALANCE_WAKE \
		\| 1*SD_WAKE_AFFINE \
		\| 1*SD_PREFER_LOCAL \
		\| 0*SD_SHARE_CPUPOWER \
		\| 0*SD_POWERSAVINGS_BALANCE \
		\| 0*SD_SHARE_PKG_RESOURCES \

include/linux/topology.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -129,7 +129,7 @@ int arch_update_cpu_topology(void);
		\| 1*SD_BALANCE_FORK \
		\| 0*SD_BALANCE_WAKE \
		\| 1*SD_WAKE_AFFINE \
		\| 1*SD_PREFER_LOCAL \
		\| 0*SD_PREFER_LOCAL \
		\| 0*SD_SHARE_CPUPOWER \
		\| 1*SD_SHARE_PKG_RESOURCES \
		\| 0*SD_SERIALIZE \
		@@ -162,7 +162,7 @@ int arch_update_cpu_topology(void);
		\| 1*SD_BALANCE_FORK \
		\| 0*SD_BALANCE_WAKE \
		\| 1*SD_WAKE_AFFINE \
		\| 1*SD_PREFER_LOCAL \
		\| 0*SD_PREFER_LOCAL \
		\| 0*SD_SHARE_CPUPOWER \
		\| 0*SD_SHARE_PKG_RESOURCES \
		\| 0*SD_SERIALIZE \