linux-kernel - Re: [PATCH 0/2] Disable zone_reclaim

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Message-ID: <21329.36761.970643.523119@quad.stoffel.home>
Date:	Fri, 18 Apr 2014 16:48:25 -0400
From:	"John Stoffel" <john@...ffel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Robert Haas <robertmhaas@...il.com>,
	Josh Berkus <josh@...iodbs.com>,
	Andres Freund <andres@...quadrant.com>,
	Christoph Lameter <cl@...ux.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michal Hocko <mhocko@...e.cz>
Subject: Re: [PATCH 0/2] Disable zone_reclaim_mode by default v2

>>>>> "Andrew" == Andrew Morton <akpm@...ux-foundation.org> writes:

Andrew> On Tue,  8 Apr 2014 09:22:58 +0100 Mel Gorman <mgorman@...e.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.  

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