linux-kernel - Re: [PATCH 1/2] mm: Disable zone_reclaim

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Message-ID: <alpine.DEB.2.10.1404080910040.8782@nuc>
Date:	Tue, 8 Apr 2014 09:14:05 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	sivanich@....com
cc:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robert Haas <robertmhaas@...il.com>,
	Josh Berkus <josh@...iodbs.com>,
	Andres Freund <andres@...quadrant.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm: Disable zone_reclaim_mode by default

On Mon, 7 Apr 2014, Mel Gorman wrote:

> zone_reclaim_mode causes processes to prefer reclaiming memory from local
> node instead of spilling over to other nodes. This made sense initially when
> NUMA machines were almost exclusively HPC and the workload was partitioned
> into nodes. The NUMA penalties were sufficiently high to justify reclaiming
> the memory. On current machines and workloads it is often the case that
> zone_reclaim_mode destroys performance but not all users know how to detect
> this. Favour the common case and disable it by default. Users that are
> sophisticated enough to know they need zone_reclaim_mode will detect it.

Ok that is going to require SGI machines to deal with zone_reclaim
configurations on bootup. Dimitri? Any comments?

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