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

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

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

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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