From: Con Kolivas <kernel@kolivas.org>
To: Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH] Performance regression in 2.6.7-rc3
Date: Tue, 15 Jun 2004 23:11:56 +1000
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Cc: Linux Kernel Mailinglist <linux-kernel@vger.kernel.org>,
       Nick Piggin <piggin@cyberone.com.au>, Andrew Morton <akpm@osdl.org>,
       "Martin J. Bligh" <mbligh@aracnet.com>,
       William Lee Irwin III <wli@holomorphy.com>,
       Linus Torvalds <torvalds@osdl.org>, markw@osdl.org
References: <200406121028.06812.kernel@kolivas.org> <20040615045616.GA2006@elte.hu>
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On Tue, 15 Jun 2004 14:56, Ingo Molnar wrote:
> * Con Kolivas <kernel@kolivas.org> wrote:
> > with a little bit of detective work and help from Wli we tracked down
> > that this patch caused it:
> > [PATCH] sched: improve wakeup-affinity
> >
> > A massive increase in idle time was observed and the throughput
> > dropped by 40% Reversing this patch gave these results:
> >
> > backsched1: http://khack.osdl.org/stp/293865/
> > Composite 	Query Processing Power 	Throughput Numerical Quantity
> > 193.93 	145.95 	257.67
> >
> > It may be best to reverse this patch until the regression is better
> > understood.
>
> agreed. It is weird because Nick said that pgsql was tested with the
> patch - and we applied the patch based on those good results. Nick?
>
> Anyway, does the patch below fix the pgsql problem? It reverts to the
> more agressive idle-balancing variant (which isnt strictly necessary for
> the bw_pipe problem).

Better than the patch backed out but still worse than it was before: 
http://khack.osdl.org/stp/293958/
Composite 	Query Processing Power 	Throughput Numerical Quantity
161.42 	152.90 	170.41

Con
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