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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: Spinlocks: Factor our GENERIC_LOCKBREAK in order to avoid spin with irqs disable
Date: Tue, 8 Jul 2008 12:08:37 +1000
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Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
       Christoph Lameter <clameter@sgi.com>, Petr Tesarik <ptesarik@suse.cz>,
       Ingo Molnar <mingo@elte.hu>, linux-kernel@vger.kernel.org
References: <Pine.LNX.4.64.0805061220570.30604@schroedinger.engr.sgi.com> <200807072152.59823.nickpiggin@yahoo.com.au> <48723C9D.8090504@goop.org>
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On Tuesday 08 July 2008 01:56, Jeremy Fitzhardinge wrote:
> Nick Piggin wrote:
> > Although, you wouldn't need to oversubscribe physical CPUs to hit
> > suboptimal behaviour.
> >
> > Basically, I just ask for performance improvement to be measured
> > with some "realistic" configuration, then it should be easier to
> > justify.
>
> Overcommitting cpus system-wide is pretty common.

(yes, sorry I meant: oversubscribing with a single guest)
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