git: kernel - Fix cluster_read random I/O heuristic

Matthew Dillon dillon at
Sun Mar 28 11:57:00 PDT 2010

    The cluster fix for random I/O's is turning out to be a pretty
    serious performance fix for programs doing a lot of random I/O,
    like postgres.  Not only does it fix the disk I/O performance but
    I am getting reports that it also reduces the VM load (since it is
    caching less read-ahead data that is never accessed).


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