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

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Message-ID: <534671DB.50802@redhat.com>
Date:	Thu, 10 Apr 2014 11:26:35 +0100
From:	Jeremy Harris <jgh@...hat.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] Disable zone_reclaim_mode by default

On 08/04/14 23:58, Christoph Lameter wrote:
> The reason that zone reclaim is on by default is that off node accesses
> are a big performance hit on large scale NUMA systems (like ScaleMP and
> SGI). Zone reclaim was written *because* those system experienced severe
> performance degradation.
>
> On the tightly coupled 4 and 8 node systems there does not seem to
> be a benefit from what I hear.

In principle, is this difference in distance something the kernel
could measure?
-- 
Cheers,
    Jeremy


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