From 840a0653100dbde599ae8ddf83fa214dfa5fd1aa Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 4 Sep 2009 11:32:54 +0200 Subject: 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 Cc: Andreas Herrmann Cc: Andreas Herrmann Cc: Gautham R Shenoy Cc: Balbir Singh LKML-Reference: Signed-off-by: Ingo Molnar --- include/linux/topology.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'include/linux/topology.h') diff --git a/include/linux/topology.h b/include/linux/topology.h index fe2c0329f82f..66774fddec9b 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 \ -- cgit v1.2.3