linux-kernel - Re: EXT4 RAID read performance

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Message-ID: <a769871e0909191554hf15150fiae155d71b47a3313@mail.gmail.com>
Date:	Sun, 20 Sep 2009 00:54:43 +0200
From:	wbrana@...il.com
To:	linux-kernel@...r.kernel.org
Subject: Re: EXT4 RAID read performance

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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