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

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Date:	Mon, 27 Aug 2007 21:23:24 +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:

> > -	if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task/2) {
> > +	if (*imbalance + SCHED_LOAD_SCALE_FUZZ < busiest_load_per_task) {
> 
> Ingo, this is still broken. This condition is always false for nice-0 
> tasks..

yes - negative reniced tasks are not spread out via this - and positive 
reniced tasks are spread out more easily.

	Ingo
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