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From: Ingo Molnar <mingo@elte.hu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: Poor PostgreSQL scaling on Linux 2.6.25-rc5 (vs 2.6.22)
Date: Tue, 11 Mar 2008 10:59:00 +0100	[thread overview]
Message-ID: <20080311095900.GU25110@elte.hu> (raw)
In-Reply-To: <200803111928.20043.nickpiggin@yahoo.com.au>


* Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> > Just a quick suggestion, does a simple runtime tune like this fix 
> > the workload:
> >
> >   for N in /proc/sys/kernel/sched_domain/*/*/flags; do
> >      echo $[`cat $N`|16] > N
> >   done
> >
> > this sets SD_WAKE_IDLE for all the nodes in the scheduler domains 
> > tree. (doing this results in over-agressive idle balancing - but if 
> > this fixes your testcase it shows that we were balancing 
> > under-agressively for this workload.) Thanks,
> 
> It doesn't change anything.
> 
> There is no idle time for this workload, btw.

oh, i thought you said that. Could you try to turn SD_WAKE_AFFINE 
all-off and all-on perhaps, via the same scriptlet?

	Ingo

  reply	other threads:[~2008-03-11  9:59 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-11  6:49 Nick Piggin
2008-03-11  7:58 ` Ingo Molnar
2008-03-11  8:28   ` Nick Piggin
2008-03-11  9:59     ` Ingo Molnar [this message]
2008-03-11 21:07 ` Nicholas Miell
2008-03-11 21:34   ` Cyrus Massoumi
2008-03-11 23:12     ` Nicholas Miell
2008-03-11 23:42       ` Nick Piggin
2008-03-11 23:47       ` Stephen Hemminger
2008-03-12  9:00       ` Zhang, Yanmin
     [not found] ` <20080311102538.GA30551@elte.hu>
     [not found]   ` <20080311120230.GA5386@elte.hu>
2008-03-12  1:21     ` Nick Piggin
2008-03-12  7:58       ` Peter Zijlstra
2008-03-17  0:44         ` Nick Piggin
2008-03-17  5:16           ` Ray Lee
2008-03-17  5:21             ` Willy Tarreau
2008-03-17  7:19               ` Nick Piggin
2008-03-17  8:26                 ` Willy Tarreau
2008-03-17  8:54                   ` Nick Piggin
2008-03-17  9:28                     ` Peter Zijlstra
2008-03-17  9:56                       ` Nick Piggin
2008-03-17 10:16                       ` Ingo Molnar
2008-03-17  5:34             ` Nick Piggin
2008-03-14 15:42 Xose Vazquez Perez

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