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    SubjectRe: [rfc] lockless pagecache


    --Andrew Morton <akpm@osdl.org> wrote (on Monday, June 27, 2005 00:46:24 -0700):

    > Nick Piggin <nickpiggin@yahoo.com.au> wrote:
    >>
    >> First I'll put up some numbers to get you interested - of a 64-way Altix
    >> with 64 processes each read-faulting in their own 512MB part of a 32GB
    >> file that is preloaded in pagecache (with the proper NUMA memory
    >> allocation).
    >
    > I bet you can get a 5x to 10x reduction in ->tree_lock traffic by doing
    > 16-page faultahead.

    Maybe true, but when we last tried that, faultahead sucked for performance
    in a more general sense. All the extra setup and teardown cost for
    unnecessary PTEs kills you, even if it's only 4 pages or so.

    M.

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