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authorIngo Molnar <mingo@elte.hu>2009-09-04 11:32:54 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-04 11:52:54 +0200
commit840a0653100dbde599ae8ddf83fa214dfa5fd1aa (patch)
tree273ffb82cb6d6f48c35d94b68e54874451956001
parent47734f89be0614b5acbd6a532390f9c72f019648 (diff)
downloadop-kernel-dev-840a0653100dbde599ae8ddf83fa214dfa5fd1aa.zip
op-kernel-dev-840a0653100dbde599ae8ddf83fa214dfa5fd1aa.tar.gz
sched: Turn on SD_BALANCE_NEWIDLE
Start the re-tuning of the balancer by turning on newidle. It improves hackbench performance and parallelism on a 4x4 box. The "perf stat --repeat 10" measurements give us: domain0 domain1 ....................................... -SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE: 2041.273208 task-clock-msecs # 9.354 CPUs ( +- 0.363% ) +SD_BALANCE_NEWIDLE -SD_BALANCE_NEWIDLE: 2086.326925 task-clock-msecs # 11.934 CPUs ( +- 0.301% ) +SD_BALANCE_NEWIDLE +SD_BALANCE_NEWIDLE: 2115.289791 task-clock-msecs # 12.158 CPUs ( +- 0.263% ) Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Andreas Herrmann <andreas.herrmann3@amd.com> Cc: Gautham R Shenoy <ego@in.ibm.com> Cc: Balbir Singh <balbir@in.ibm.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/include/asm/topology.h2
-rw-r--r--include/linux/topology.h4
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index be29eb8..ef7bc7f 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -142,7 +142,7 @@ extern unsigned long node_remap_size[];
.forkexec_idx = SD_FORKEXEC_IDX, \
\
.flags = 1*SD_LOAD_BALANCE \
- | 0*SD_BALANCE_NEWIDLE \
+ | 1*SD_BALANCE_NEWIDLE \
| 1*SD_BALANCE_EXEC \
| 1*SD_BALANCE_FORK \
| 0*SD_WAKE_IDLE \
diff --git a/include/linux/topology.h b/include/linux/topology.h
index fe2c032..66774fd 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -126,7 +126,7 @@ int arch_update_cpu_topology(void);
.forkexec_idx = 1, \
\
.flags = 1*SD_LOAD_BALANCE \
- | 0*SD_BALANCE_NEWIDLE \
+ | 1*SD_BALANCE_NEWIDLE \
| 1*SD_BALANCE_EXEC \
| 1*SD_BALANCE_FORK \
| 0*SD_WAKE_IDLE \
@@ -160,7 +160,7 @@ int arch_update_cpu_topology(void);
.forkexec_idx = 1, \
\
.flags = 1*SD_LOAD_BALANCE \
- | 0*SD_BALANCE_NEWIDLE \
+ | 1*SD_BALANCE_NEWIDLE \
| 1*SD_BALANCE_EXEC \
| 1*SD_BALANCE_FORK \
| 0*SD_WAKE_IDLE \
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