]> err.no Git - linux-2.6/commit
[PATCH] sched: HT optimisation
authorNick Piggin <nickpiggin@yahoo.com.au>
Sat, 10 Sep 2005 07:26:19 +0000 (00:26 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Sat, 10 Sep 2005 17:06:23 +0000 (10:06 -0700)
commit5969fe0618051e8577316555a81a6e44b7b7d640
tree09ca92684811017901bb08d8d3a76c52022ef34d
parente17224bf1d01b461ec02a60f5a9b7657a89bdd23
[PATCH] sched: HT optimisation

If an idle sibling of an HT queue encounters a busy sibling, then make
higher level load balancing of the non-idle variety.

Performance of multiprocessor HT systems with low numbers of tasks
(generally < number of virtual CPUs) can be significantly worse than the
exact same workloads when running in non-HT mode.  The reason is largely
due to poor scheduling behaviour.

This patch improves the situation, making the performance gap far less
significant on one problematic test case (tbench).

Signed-off-by: Nick Piggin <npiggin@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
kernel/sched.c