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    SubjectRe: swapper: page allocation failure.
    Chris Wedgwood wrote:
    > On Sun, May 21, 2006 at 11:31:12AM +0200, Haar J?nos wrote:
    >
    >
    >>[root@st-0001 /]# uname -a
    >>Linux st-0001 2.6.17-rc3-git1 #2 SMP Sun May 21 01:12:22 CEST 2006 i686 i686 i386 GNU/Linux
    >
    >
    > did earlier kernels work OK?
    >
    >
    >>This is a simple disk node.
    >>It serves the md0 array, and uses mem for buffering-caching.
    >
    >
    > odd, i looks like you've leaked alot of lowmem but i can't think why
    >
    > i've got major (induced) brain-fog right now so i'll have to think
    > about it tomorrow sorry

    The buffers are buffercache rather than the usual pagecache; due to
    nbd I guess. Buffercache cannot be satisfied by highmem.

    This would be a relatively uncommon setup, which explains why it
    isn't working 100%. I don't know of any reason why reclaim speed
    should be worse for buffercache, however one notable thing will be
    that zone_normal's lowmem reserve that is untouchable by pagecache
    will be eaten by buffercache...

    Anyway, increasing /proc/sys/vm/min_free_kbytes should help. Janos,
    perhaps you could try doubling it and see how you go?

    --
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