linux-kernel - Re: [LKP] [sched/numa] a43455a1d57: +94.1% proc-vmstat.numa_hint_faults

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Date:	Thu, 31 Jul 2014 17:57:23 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Aaron Lu <aaron.lu@...el.com>, LKML <linux-kernel@...r.kernel.org>,
	lkp@...org, jhladky@...hat.com
Subject: Re: [LKP] [sched/numa] a43455a1d57: +94.1%
 proc-vmstat.numa_hint_faults_local

On Thu, Jul 31, 2014 at 12:42:41PM +0200, Peter Zijlstra wrote:
> On Tue, Jul 29, 2014 at 02:39:40AM -0400, Rik van Riel wrote:
> > On Tue, 29 Jul 2014 13:24:05 +0800
> > Aaron Lu <aaron.lu@...el.com> wrote:
> > 
> > > FYI, we noticed the below changes on
> > > 
> > > git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> > > commit a43455a1d572daf7b730fe12eb747d1e17411365 ("sched/numa: Ensure task_numa_migrate() checks the preferred node")
> > > 
> > > ebe06187bf2aec1  a43455a1d572daf7b730fe12e  
> > > ---------------  -------------------------  
> > >      94500 ~ 3%    +115.6%     203711 ~ 6%  ivb42/hackbench/50%-threads-pipe
> > >      67745 ~ 4%     +64.1%     111174 ~ 5%  lkp-snb01/hackbench/50%-threads-socket
> > >     162245 ~ 3%     +94.1%     314885 ~ 6%  TOTAL proc-vmstat.numa_hint_faults_local
> > 
> > Hi Aaron,
> > 
> > Jirka Hladky has reported a regression with that changeset as
> > well, and I have already spent some time debugging the issue.
> 
> Let me see if I can still find my SPECjbb2005 copy to see what that
> does.

Jirka, what kind of setup were you seeing SPECjbb regressions?

I'm not seeing any on 2 sockets with a single SPECjbb instance, I'll go
check one instance per socket now.



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