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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 /arch/x86
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 'arch/x86')
-rw-r--r--arch/x86/include/asm/topology.h4
1 files changed, 1 insertions, 3 deletions
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 4b1b335097b5..7fafd1bc4149 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -116,14 +116,12 @@ extern unsigned long node_remap_size[];
# define SD_CACHE_NICE_TRIES 1
# define SD_IDLE_IDX 1
-# define SD_NEWIDLE_IDX 2
# define SD_FORKEXEC_IDX 0
#else
# define SD_CACHE_NICE_TRIES 2
# define SD_IDLE_IDX 2
-# define SD_NEWIDLE_IDX 2
# define SD_FORKEXEC_IDX 1
#endif
@@ -137,7 +135,7 @@ extern unsigned long node_remap_size[];
.cache_nice_tries = SD_CACHE_NICE_TRIES, \
.busy_idx = 3, \
.idle_idx = SD_IDLE_IDX, \
- .newidle_idx = SD_NEWIDLE_IDX, \
+ .newidle_idx = 0, \
.wake_idx = 0, \
.forkexec_idx = SD_FORKEXEC_IDX, \
\