Commit 840a0653 authored Sep 04, 2009 by Ingo Molnar

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>

parent 47734f89

arch/x86/include/asm/topology.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -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 \

include/linux/topology.h

+2 −2

Original line number	Diff line number	Diff line
		@@ -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 \