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

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Date:	Thu, 31 Jul 2014 02:42:54 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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, 31 Jul 2014 13:04:54 +0800
Aaron Lu <aaron.lu@...el.com> wrote:

> On Wed, Jul 30, 2014 at 10:25:03AM -0400, Rik van Riel wrote:
> > On 07/29/2014 10:14 PM, Aaron Lu wrote:

> > >> +#define NUMA_SCALE 1024
> > >> +#define NUMA_MOVE_THRESH (5 * NUMA_SCALE / 100)
> > 
> > It would be good to see if changing NUMA_MOVE_THRESH to
> > (NUMA_SCALE / 8) does the trick.

FWIW, running with NUMA_MOVE_THRESH set to (NUMA_SCALE / 8)
seems to resolve the SPECjbb2005 threshold on my system.

I will run some more sanity tests later today...

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