[lkml]   [2005]   [Mar]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: NFS client latencies
    Ingo Molnar <> wrote:
    > * Trond Myklebust <> wrote:
    > > > The 7 ms are spent in this loop:
    > >
    > > Which is basically confirming what the guys from Bull already told me,
    > > namely that the radix tree tag stuff is much less efficient that what
    > > we've got now. I never saw their patches, though, so I was curious to
    > > try it for myself.
    > i think the numbers are being misinterpreted. I believe this patch is a
    > big step forward. The big thing is that nfs_list_add_request() is O(1)
    > now - while _a single request addition to the sorted list_ triggered the
    > 1+ msec latency in Lee's previous trace.

    Well. The radix-tree approach's best-case is probably quite a lot worse
    than the list-based approach's best-case. It hits a lot more cachelines
    and involves a lot more code.

    But of course the radix-tree's worst-case will be far better than list's.

    And presumably that list-based code rarely hits the worst-case, else it
    would have been changed by now.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-04-06 13:31    [W:0.022 / U:8.236 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site