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authorMike Galbraith <efault@gmx.de>2009-11-02 19:36:51 (GMT)
committerIngo Molnar <mingo@elte.hu>2009-11-03 06:24:07 (GMT)
commit6b9de613ae9c79b637e070136585dde029578065 (patch)
treeab567c71852bf5dec21ab97e7dc3db1594a0ac7f /arch
parent49557e620339cb134127b5bfbcfecc06b77d0232 (diff)
downloadlinux-6b9de613ae9c79b637e070136585dde029578065.tar.xz
sched: Disable SD_PREFER_LOCAL at node level
Yanmin Zhang reported that SD_PREFER_LOCAL induces an order of magnitude increase in select_task_rq_fair() overhead while running heavy wakeup benchmarks (tbench and vmark). Since SD_BALANCE_WAKE is off at node level, turn SD_PREFER_LOCAL off as well pending further investigation. Reported-by: Zhang, Yanmin <yanmin_zhang@linux.intel.com> Signed-off-by: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/include/asm/topology.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index d823c24..40e37b10 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -143,7 +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_PREFER_LOCAL \
| 0*SD_SHARE_CPUPOWER \
| 0*SD_POWERSAVINGS_BALANCE \
| 0*SD_SHARE_PKG_RESOURCES \