linux-kernel - Re: [PATCH] sched: avoid large irq-latencies in smp-balancing

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Message-Id: <200711100009.56215.nickpiggin@yahoo.com.au>
Date:	Sat, 10 Nov 2007 00:09:55 +1100
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Gregory Haskins <gregory.haskins.ml@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Peter Williams <pwil3058@...pond.net.au>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched: avoid large irq-latencies in smp-balancing

On Thursday 08 November 2007 15:37, Gregory Haskins wrote:
> Peter Zijlstra wrote:
> > Bah, missed a hunk
> >
> > ---
> > Subject: sched: avoid large irq-latencies in smp-balancing
> >
> > SMP balancing is done with IRQs disabled and can iterate the full rq.
> > When rqs are large this can cause large irq-latencies. Limit the nr of
> > iterations on each run.
> >
> > Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> > CC: Peter Williams <pwil3058@...pond.net.au>
>
> Tested-by: Gregory Haskins <ghaskins@...ell.com> (as part of 23.1-rt11)

OK, but let's not make this default for mainline just yet please. There
are so many performance regression possibilities in 2.6.24 already that
we should go a little bit slower for now IMO.
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