Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b47e8608a08766ef8121cd747d3aaf6c3dc22649 Commit: b47e8608a08766ef8121cd747d3aaf6c3dc22649 Parent: e4903fb59590f86190280a549420f6cb85bd7f7e Author: Ingo Molnar <[EMAIL PROTECTED]> AuthorDate: Thu Jul 26 13:40:43 2007 +0200 Committer: Ingo Molnar <[EMAIL PROTECTED]> CommitDate: Thu Jul 26 13:40:43 2007 +0200
[PATCH] sched: increase SCHED_LOAD_SCALE_FUZZ increase SCHED_LOAD_SCALE_FUZZ that adds a small amount of over-balancing: to help distribute CPU-bound tasks more fairly on SMP systems. the problem of unfair balancing was noticed and reported by Tong N Li. 10 CPU-bound tasks running on 8 CPUs, v2.6.23-rc1: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2572 mingo 20 0 1576 244 196 R 100 0.0 1:03.61 loop 2578 mingo 20 0 1576 248 196 R 100 0.0 1:03.59 loop 2576 mingo 20 0 1576 248 196 R 100 0.0 1:03.52 loop 2571 mingo 20 0 1576 244 196 R 100 0.0 1:03.46 loop 2569 mingo 20 0 1576 244 196 R 99 0.0 1:03.36 loop 2570 mingo 20 0 1576 244 196 R 95 0.0 1:00.55 loop 2577 mingo 20 0 1576 248 196 R 50 0.0 0:31.88 loop 2574 mingo 20 0 1576 248 196 R 50 0.0 0:31.87 loop 2573 mingo 20 0 1576 248 196 R 50 0.0 0:31.86 loop 2575 mingo 20 0 1576 248 196 R 50 0.0 0:31.86 loop v2.6.23-rc1 + patch: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2681 mingo 20 0 1576 244 196 R 85 0.0 3:51.68 loop 2688 mingo 20 0 1576 244 196 R 81 0.0 3:46.35 loop 2682 mingo 20 0 1576 244 196 R 80 0.0 3:43.68 loop 2685 mingo 20 0 1576 248 196 R 80 0.0 3:45.97 loop 2683 mingo 20 0 1576 248 196 R 80 0.0 3:40.25 loop 2679 mingo 20 0 1576 244 196 R 80 0.0 3:33.53 loop 2680 mingo 20 0 1576 244 196 R 79 0.0 3:43.53 loop 2686 mingo 20 0 1576 244 196 R 79 0.0 3:39.31 loop 2687 mingo 20 0 1576 244 196 R 78 0.0 3:33.31 loop 2684 mingo 20 0 1576 244 196 R 77 0.0 3:27.52 loop so they now nicely converge to the expected 80% long-term CPU usage. Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]> --- include/linux/sched.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index 33b9b48..7c61b50 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -681,7 +681,7 @@ enum cpu_idle_type { #define SCHED_LOAD_SHIFT 10 #define SCHED_LOAD_SCALE (1L << SCHED_LOAD_SHIFT) -#define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 5) +#define SCHED_LOAD_SCALE_FUZZ (SCHED_LOAD_SCALE >> 1) #ifdef CONFIG_SMP #define SD_LOAD_BALANCE 1 /* Do load balancing on this domain. */ - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html