Re: [patch 2/2] sched: fix select_idle_sibling() logic inselect_task_rq_fair()

[Mike Galbraith]

On Fri, 2010-03-05 at 10:39 -0800, Suresh Siddha wrote:
> plain text document attachment (fix_lat_ctx.patch)
> Performance improvements with this patch:
> "lat_ctx -s 0 2" ~22usec (before-this-patch)	~5usec (after-this-patch)

BTW, is your cpu governor kicking into high gear?  That unpatched number
looks like a throttled down cpu to me.  I know on my box, when there are
micro idles, sometimes cores do not throttle up, making for some fairly
crappy numbers.  Q6600 doesn't throttle down far enough to make such a
_huge_ difference though.

	-Mike

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