Messages in this thread | | | Date | Sun, 4 Mar 2007 20:24:53 -0800 | From | "Siddha, Suresh B" <> | Subject | Re: [patch] sched: optimize siblings status check logic in wake_idle() |
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On Mon, Mar 05, 2007 at 05:58:31AM +0100, Nick Piggin wrote: > On Sun, Mar 04, 2007 at 08:13:09PM -0800, Suresh B wrote: > > On a 16 node system, we have seen ~1.25% perf improvement on a database workload > > when we completely short circuited wake_idle(). This patch is trying to comeup > > with a best compromise to avoid the cache misses and also minimize the latenices, > > perf impact. > > Hmm, I wonder what if we only wake_idle if the wakeup comes from this > CPU or a sibling? That's probably going to have downsides in some > workloads as well, though.
yep. I thought about it and thought this patch is a decent solution.
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