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    SubjectRe: XFS filesystem performance drop in kernels 2.6.16+
    Below is a simplified version of the test program, and results of
    testing different kernels/filesystems/mount options. The results are a
    little different from the ones described in the initial post (this
    time performance decreased "only" 2 times), but the general tendency
    is clearly the same.


    ============ 2.6.19-rc5-git2 ============

    mount -t xfs -o noatime,barrier /dev/sdc1 /mnt/disc

    real 16m40.516s
    user 0m17.989s
    sys 9m36.320s

    mount -t xfs -o noatime,nobarrier /dev/sdc1 /mnt/disc

    real 15m40.212s
    user 0m17.549s
    sys 9m29.692s

    mount -t ext3 -o noatime /dev/sdc1 /mnt/disc

    real 49m44.728s
    user 0m27.678s
    sys 14m15.689s

    ============ 2.6.14.6 ============

    mount -t xfs -o noatime /dev/sdc1 /mnt/disc

    real 9m58.974s
    user 0m17.373s
    sys 8m4.850s

    mount -t ext3 -o noatime /dev/sdc1 /mnt/disc

    real 49m7.526s
    user 0m26.278s
    sys 12m37.627s

    ========================================

    #include <stdio.h>
    #include <fcntl.h>
    #include <unistd.h>

    #define __BYTES 8192
    #define __FILES 1000

    char buf [__BYTES];

    int main ()
    {
    char fname [1024];
    int nFiles [__FILES];
    int f, i;

    /* Fill buf */
    for (i = 0; i < __BYTES; i++)
    buf [i] = i % 128;

    /* Create and open files */
    for (f = 0; f < __FILES; f++) {
    sprintf (fname, "/mnt/disc/storage/file-%d", f);
    nFiles [f] = open (fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    }

    for (i = 0; i < 262144; i++) {
    /* Write data to a big file */
    write (nFiles [0], buf, __BYTES);

    /* Write data to small files */
    for (f = 1; f < __FILES; f++)
    write (nFiles [f], &f, sizeof (f));
    }

    for (f = 0; f < __FILES; f++) {
    fsync (nFiles [f]);
    close (nFiles [f]);
    }

    return 0;
    }

    ========================================

    --
    Igor A. Valcov
    -
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