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    SubjectRe: AVL and hash in memory management
       Date: Sat, 19 Sep 1998 11:49:31 +0200
    From: Martin Mares <>

    > Research work shows that only at around 1000 entires does the lookup
    > speed make up for the balancing cost of a tree.

    Was this research done for the Linux VMA case or for some "average" access
    patterns used by the database folks? The latter would be of little use since
    in most cases we have more finds than inserts/deletes (*much* more on a i386
    where we need it for access_ok()).

    Two of the sample cases (amongst others) were Linux VMA and Schoebel's
    new I/O layer subsystem. The others were scattered over various other
    applications such as routing table lookups etc.

    David S. Miller

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