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    Subject[PATCH 0/8][RFC] IO latency/throughput fixes
    Date
    Hi,

    This is a set of patches that I worked on today in the hopes
    of furthering the latency goals and at least fixing some of
    the write regression with fwrite + fsync that current -git
    is suffering from.

    I haven't done any latency tests yet, I'm just tossing this
    out there so we can collaborate on improving things. What I
    did test was the silly fwrite() + fsync() loop test, which
    is a LOT slower in current -git that it used to be. The test
    is basically:

    while (nr--) {
    f = fopen();
    fprintf(f, "Some data here\n");
    fsync(fileno(f));
    fclose(f);
    }

    which (for nr == 2000) takes 16 seconds in -git, completes
    in 0.9s with the patches.

    --
    Jens Axboe



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