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Date: Wed, 17 Dec 2003 13:41:04 -0800
From: Andrew Morton <akpm@osdl.org>
To: Roger Luethi <rl@hellgate.ch>
Cc: riel@redhat.com, andrea@suse.de, wli@holomorphy.com, kernel@kolivas.org,
       chris@cvine.freeserve.co.uk, linux-kernel@vger.kernel.org,
       mbligh@aracnet.com
Subject: Re: 2.6.0-test9 - poor swap performance on low end machines
Message-Id: <20031217134104.5a477e6e.akpm@osdl.org>
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Roger Luethi <rl@hellgate.ch> wrote:
>
> FWIW akpm posted a patch to initialize min_free_kbytes depending on
> available RAM which seemed to make sense but it hasn't made it into
> mainline yet.

Yup.  ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.0-test11/2.6.0-test11-mm1/broken-out/scale-min_free_kbytes.patch

Also, note that setup_per_zone_pages_min() plays games to ensure that the
highmem zone's free pages limit is small: there's not a lot of point in
keeping lots of highmem pages free.