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    SubjectRe: EXT4 RAID read performance
    From
    creating tar of compiled kernel takes much longer with ext4

    time tar c linux-2.6.31 | cat >/dev/null

    reiser3:
    real 0m11.425s
    user 0m0.229s
    sys 0m1.586s

    ext4:
    real 0m23.942s
    user 0m0.183s
    sys 0m1.440s

    partition was remounted before test

    >
    > RAID details:
    >
    > md8 : active raid10 sda7[0] sdd7[3] sdc7[2] sdb7[1]
    >      62925824 blocks 256K chunks 2 far-copies [4/4] [UUUU]
    >
    > Ext4:
    > mkfs.ext4 -E stride=64,stripe-width=128 /dev/md8
    > mount -t ext4 -o noatime,auto_da_alloc,commit=600 /dev/md8 /mnt/md8
    >
    > Reiser3:
    > mkfs.reiserfs /dev/md8
    > mount -t reiserfs -o noatime,notail /dev/md8 /mnt/md8
    >
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