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authorMike Galbraith <efault@gmx.de>2009-09-15 17:07:03 +0400
committerIngo Molnar <mingo@elte.hu>2009-09-15 18:51:16 +0400
commit0ec9fab3d186d9cbb00c0f694d4a260d07c198d9 (patch)
tree07773edcece2dd82a63265e027793fe8b2231960 /include/linux/topology.h
parent6bd7821f905a8d6c471f0d6675f5cb7ea448d791 (diff)
downloadlinux-0ec9fab3d186d9cbb00c0f694d4a260d07c198d9.tar.xz
sched: Improve latencies and throughput
Make the idle balancer more agressive, to improve a x264 encoding workload provided by Jason Garrett-Glaser: NEXT_BUDDY NO_LB_BIAS encoded 600 frames, 252.82 fps, 22096.60 kb/s encoded 600 frames, 250.69 fps, 22096.60 kb/s encoded 600 frames, 245.76 fps, 22096.60 kb/s NO_NEXT_BUDDY LB_BIAS encoded 600 frames, 344.44 fps, 22096.60 kb/s encoded 600 frames, 346.66 fps, 22096.60 kb/s encoded 600 frames, 352.59 fps, 22096.60 kb/s NO_NEXT_BUDDY NO_LB_BIAS encoded 600 frames, 425.75 fps, 22096.60 kb/s encoded 600 frames, 425.45 fps, 22096.60 kb/s encoded 600 frames, 422.49 fps, 22096.60 kb/s Peter pointed out that this is better done via newidle_idx, not via LB_BIAS, newidle balancing should look for where there is load _now_, not where there was load 2 ticks ago. Worst-case latencies are improved as well as no buddies means less vruntime spread. (as per prior lkml discussions) This change improves kbuild-peak parallelism as well. Reported-by: Jason Garrett-Glaser <darkshikari@gmail.com> Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1253011667.9128.16.camel@marge.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include/linux/topology.h')
-rw-r--r--include/linux/topology.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h
index c87edcd87967..4298745615a5 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -151,7 +151,7 @@ int arch_update_cpu_topology(void);
.cache_nice_tries = 1, \
.busy_idx = 2, \
.idle_idx = 1, \
- .newidle_idx = 2, \
+ .newidle_idx = 0, \
.wake_idx = 0, \
.forkexec_idx = 1, \
\