linux-kernel - EXT4 RAID read performance

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Message-ID: <a769871e0909191112t3adb852cn93d72dc5fd94b9fd@mail.gmail.com>
Date:	Sat, 19 Sep 2009 20:12:31 +0200
From:	wbrana@...il.com
To:	linux-kernel@...r.kernel.org
Subject: EXT4 RAID read performance

Hello,

I'm considering replacing Reiser3 filesystem with some newer one.
I ran compilebench benchmark. Read performance is lower with ext4.
Is it expected or is it possible to fix it?

Ext4:
read tree total runs 11 avg 20.47 MB/s (user 0.53s sys 0.74s)
read compiled tree total runs 4 avg 32.94 MB/s (user 0.61s sys 1.17s)

Reiser3:
read tree total runs 11 avg 26.33 MB/s (user 0.54s sys 0.81s)
read compiled tree total runs 4 avg 41.82 MB/s (user 0.62s sys 1.36s)

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:
mount -t reiserfs /dev/md8 /mnt/md8
mount -t reiserfs -o noatime,notail /dev/md8 /dev/md8

Ext4 results:
intial create total runs 10 avg 172.76 MB/s (user 0.43s sys 0.60s)
create total runs 14 avg 36.49 MB/s (user 0.42s sys 0.59s)
patch total runs 15 avg 15.16 MB/s (user 0.24s sys 0.49s)
compile total runs 14 avg 64.07 MB/s (user 0.10s sys 0.59s)
clean total runs 10 avg 393.43 MB/s (user 0.02s sys 0.06s)
read tree total runs 11 avg 20.47 MB/s (user 0.53s sys 0.74s)
read compiled tree total runs 4 avg 32.94 MB/s (user 0.61s sys 1.17s)
delete tree total runs 10 avg 2.51 seconds (user 0.24s sys 0.42s)
delete compiled tree total runs 4 avg 2.63 seconds (user 0.28s sys 0.50s)
stat tree total runs 11 avg 1.99 seconds (user 0.23s sys 0.18s)
stat compiled tree total runs 7 avg 2.11 seconds (user 0.27s sys 0.21s)

Reiser3 results:
intial create total runs 10 avg 82.74 MB/s (user 0.45s sys 1.13s)
create total runs 14 avg 28.54 MB/s (user 0.45s sys 1.19s)
patch total runs 15 avg 10.91 MB/s (user 0.24s sys 0.86s)
compile total runs 14 avg 47.49 MB/s (user 0.10s sys 1.27s)
clean total runs 10 avg 270.21 MB/s (user 0.02s sys 0.15s)
read tree total runs 11 avg 26.33 MB/s (user 0.54s sys 0.81s)
read compiled tree total runs 4 avg 41.82 MB/s (user 0.62s sys 1.36s)
delete tree total runs 10 avg 3.38 seconds (user 0.24s sys 0.72s)
delete compiled tree total runs 4 avg 4.14 seconds (user 0.27s sys 0.88s)
stat tree total runs 11 avg 2.09 seconds (user 0.22s sys 0.18s)
stat compiled tree total runs 7 avg 2.27 seconds (user 0.25s sys 0.21s)
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