From: Nick Piggin <nickpiggin@yahoo.com.au>
Date: Sat, 10 Sep 2005 07:26:19 +0000 (-0700)
Subject: [PATCH] sched: HT optimisation
X-Git-Tag: v2.6.14-rc1~213
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5969fe0618051e8577316555a81a6e44b7b7d640;p=pandora-kernel.git

[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>
---

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