From: Con Kolivas <kernel@kolivas.org>
To: Ingo Molnar <mingo@elte.hu>
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
Subject: Re: [PATCH] Performance regression in 2.6.7-rc3
Date: Tue, 15 Jun 2004 23:11:56 +1000 [thread overview]
Message-ID: <200406152311.56633.kernel@kolivas.org> (raw)
In-Reply-To: <20040615045616.GA2006@elte.hu>
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
next prev parent reply other threads:[~2004-06-15 13:12 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-12 0:28 [PATCH] Performance regression in 2.6.7-rc3 Con Kolivas
2004-06-12 7:58 ` Nick Piggin
2004-06-15 4:56 ` Ingo Molnar
2004-06-15 13:11 ` Con Kolivas [this message]
2004-06-15 15:02 ` Martin J. Bligh
2004-06-16 2:14 ` Herbert Xu
2004-06-16 3:05 ` Nick Piggin
2004-06-16 3:10 ` Linus Torvalds
2004-06-16 3:18 ` Nick Piggin
2004-06-16 7:02 ` Ingo Molnar
2004-06-16 3:09 ` Linus Torvalds
2004-06-16 14:54 ` Martin J. Bligh
2004-06-16 3:00 ` Nick Piggin
2004-06-16 1:22 ` Con Kolivas
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