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authorAlex Shi <alex.shi@intel.com>2012-07-20 10:19:50 +0400
committerIngo Molnar <mingo@kernel.org>2012-07-26 13:46:58 +0400
commit6956dc568f34107f1d02b24f87efe7250803fc87 (patch)
tree6372cf6bbb73c0afd0f4b449344915b846956d67 /include/linux/topology.h
parent8323f26ce3425460769605a6aece7a174edaa7d1 (diff)
downloadlinux-6956dc568f34107f1d02b24f87efe7250803fc87.tar.xz
sched/numa: Add SD_PERFER_SIBLING to CPU domain
Commit 8e7fbcbc22c ("sched: Remove stale power aware scheduling remnants and dysfunctional knobs") removed SD_PERFER_SIBLING from the CPU domain. On NUMA machines this causes that load_balance() doesn't perfer LCPU in same physical CPU package. It causes some actual performance regressions on our NUMA machines from Core2 to NHM and SNB. Adding this domain flag again recovers the performance drop. This change doesn't have any bad impact on any of my benchmarks: specjbb, kbuild, fio, hackbench .. etc, on all my machines. Signed-off-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1342765190-21540-1-git-send-email-alex.shi@intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/topology.h')
-rw-r--r--include/linux/topology.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h
index e91cd43394df..fec12d667211 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -164,6 +164,7 @@ int arch_update_cpu_topology(void);
| 0*SD_SHARE_CPUPOWER \
| 0*SD_SHARE_PKG_RESOURCES \
| 0*SD_SERIALIZE \
+ | 1*SD_PREFER_SIBLING \
, \
.last_balance = jiffies, \
.balance_interval = 1, \