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authorMike Galbraith <efault@gmx.de>2009-09-15 15:07:03 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-15 16:51:16 +0200
commit0ec9fab3d186d9cbb00c0f694d4a260d07c198d9 (patch)
tree07773edcece2dd82a63265e027793fe8b2231960 /kernel
parent6bd7821f905a8d6c471f0d6675f5cb7ea448d791 (diff)
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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 'kernel')
-rw-r--r--kernel/sched_features.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched_features.h b/kernel/sched_features.h
index 891ea0f72b46..e98c2e8de1d5 100644
--- a/kernel/sched_features.h
+++ b/kernel/sched_features.h
@@ -67,7 +67,7 @@ SCHED_FEAT(AFFINE_WAKEUPS, 1)
* wakeup-preemption), since its likely going to consume data we
* touched, increases cache locality.
*/
-SCHED_FEAT(NEXT_BUDDY, 1)
+SCHED_FEAT(NEXT_BUDDY, 0)
/*
* Prefer to schedule the task that ran last (when we did