From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Gregory Haskins <gregory.haskins.ml@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@elte.hu>,
Peter Williams <pwil3058@bigpond.net.au>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] sched: avoid large irq-latencies in smp-balancing
Date: Sat, 10 Nov 2007 00:09:55 +1100 [thread overview]
Message-ID: <200711100009.56215.nickpiggin@yahoo.com.au> (raw)
In-Reply-To: <4732929D.604@gmail.com>
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@chello.nl>
> > CC: Peter Williams <pwil3058@bigpond.net.au>
>
> Tested-by: Gregory Haskins <ghaskins@novell.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.
next prev parent reply other threads:[~2007-11-09 13:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 11:29 Peter Zijlstra
2007-11-07 12:17 ` Peter Zijlstra
2007-11-07 18:27 ` Andrew Morton
2007-11-07 18:58 ` Peter Zijlstra
2007-11-07 22:10 ` Steven Rostedt
2007-11-08 0:24 ` Eric St-Laurent
2007-11-08 4:37 ` Gregory Haskins
2007-11-09 13:09 ` Nick Piggin [this message]
2007-11-09 12:41 ` DM
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