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Date: Sun, 20 Apr 2014 21:59:23 +0100
From: Mel Gorman <mgorman@suse.de>
Subject: Re: [PATCH 0/2] Disable zone_reclaim_mode by default v2
Message-ID: <20140420205923.GA23991@suse.de>
References: <1396945380-18592-1-git-send-email-mgorman@suse.de>
 <20140418130543.8619064c0e5d26cd914c4c3c@linux-foundation.org>
 <21329.36761.970643.523119@quad.stoffel.home>
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To: John Stoffel <john@stoffel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>, Robert Haas <robertmhaas@gmail.com>, Josh Berkus <josh@agliodbs.com>, Andres Freund <andres@2ndquadrant.com>, Christoph Lameter <cl@linux.com>, Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.cz>

On Fri, Apr 18, 2014 at 04:48:25PM -0400, John Stoffel wrote:
> >>>>> "Andrew" == Andrew Morton <akpm@linux-foundation.org> writes:
> 
> Andrew> On Tue,  8 Apr 2014 09:22:58 +0100 Mel Gorman <mgorman@suse.de> wrote:
> >> Changelog since v1
> >> o topology comment updates
> >> 
> >> When it was introduced, zone_reclaim_mode made sense as NUMA distances
> >> punished and workloads were generally partitioned to fit into a NUMA
> >> node. NUMA machines are now common but few of the workloads are NUMA-aware
> >> and it's routine to see major performance due to zone_reclaim_mode being
> >> enabled but relatively few can identify the problem.
> 
> 
> This is unclear here.  "see major performance <what> due" doesn't make
> sense to me.  
> 

Degradation

-- 
Mel Gorman
SUSE Labs

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