linux-kernel - Re: [patch] sched: fix broken smt/mc optimizations with CFS

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Date:	Wed, 29 Aug 2007 05:42:14 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [patch] sched: fix broken smt/mc optimizations with CFS


* Siddha, Suresh B <suresh.b.siddha@...el.com> wrote:

> On Mon, Aug 27, 2007 at 12:31:03PM -0700, Siddha, Suresh B wrote:
> > Essentially I observed that nice 0 tasks still endup on two cores of same
> > package, with out getting spread out to two different packages. This behavior
> > is same with out this fix and this fix doesn't help in any way.
> 
> Ingo, Appended patch seems to fix the issue and as far as I can test, 
> seems ok to me.

thanks! I've queued your fix up for .23 merge. I've done a quick test 
and it indeed seems to work well.

> This is a quick fix for .23. Peter Williams and myself plan to look at 
> code cleanups in this area (HT/MC optimizations) post .23
> 
> BTW, with this fix, do you want to retain the current FUZZ value?

what value would you suggest? I was thinking about using 
busiest_rq->curr->load.weight instead, to always keep rotating tasks.

	Ingo
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