lkml.org 
[lkml]   [2008]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: RAID-1 performance under 2.4 and 2.6
Le Wed, 26 Mar 2008 12:15:57 +0100
"Bart Van Assche" <bart.vanassche@gmail.com> écrivait:

> You are welcome to post the numbers you obtained with dd for direct
> I/O on a RAID-1 setup for 2.4 versus 2.6 kernel.

Here we go (tested on a slightly slower hardware : Athlon64 3000+,
nVidia chipset) . Actually, direct IO result is identical. However, the
significant number for the end user in this case is the NFS thruput.

2.4 kernel (2.4.32), async write
--------------------------------
root@0[root]# ./dd if=/dev/zero of=/mnt/raid/testdd01 bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 13.407 seconds, 80.1 MB/s

2.4 kernel (2.4.32), async write thru NFS mount
--------------------------------
emmanuel[/mnt/temp]$ dd if=/dev/zero of=./testdd01 bs=1M count=1024
1024+0 enregistrements lus
1024+0 enregistrements écrits
1073741824 bytes (1,1 GB) copied, 15,5176 s, 69,2 MB/s

2.4 kernel (2.4.32), async read
--------------------------------
root@0[root]# ./dd if=/mnt/raid/testdd01 of=/dev/null bs=1M
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 15.752 seconds, 68.2 MB/s

2.4 kernel (2.4.32), sync write
--------------------------------
root@0[root]# ./dd if=/dev/zero of=/mnt/raid/testdd01 bs=1M count=1024 \
oflag=direct,dsync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 21.7874 seconds, 49.3 MB/s

2.6 kernel (2.6.22.18), async write
--------------------------------
root@0[root]# ./dd if=/dev/zero of=/mnt/raid/testdd02 bs=1M
count=1024 1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 17.1347 seconds, 62.7 MB/s

2.6 kernel (2.6.22.18), async write thru NFS mount
--------------------------------
emmanuel[/mnt/temp]$ dd if=/dev/zero of=./testdd02 bs=1M count=1024
1024+0 enregistrements lus
1024+0 enregistrements écrits
1073741824 bytes (1,1 GB) copied, 21,3618 s, 50,3 MB/s

2.6 kernel (2.6.22.18), async read
--------------------------------
root@0[root]# ./dd if=/mnt/raid/testdd02 of=/dev/null bs=1M
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 15.7599 seconds, 68.1 MB/s

2.6 kernel (2.6.22.18), sync write
--------------------------------
root@0[root]# ./dd if=/dev/zero of=/mnt/raid/testdd02 bs=1M count=1024 \
oflag=direct,dsync
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 21.7011 seconds, 49.5 MB/s

--
----------------------------------------
Emmanuel Florac | Intellique
----------------------------------------

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2008-03-26 13:39    [W:0.080 / U:1.372 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site