WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-users] Xen Disk I/O performance vs native performance

To: Sami Dalouche <skoobi@xxxxxxx>
Subject: Re: [Xen-users] Xen Disk I/O performance vs native performance
From: Brock Palen <brockp@xxxxxxxxx>
Date: Thu, 24 Jan 2008 17:51:57 -0500
Cc: Christophe Clapp <christophe.clapp@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx, Florent Valdelièvre <Florent.Valdelievre@xxxxxxxxxx>
Delivery-date: Thu, 24 Jan 2008 15:02:35 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxx
In-reply-to: <1201214216.10218.5.camel@whiteair>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <1201214216.10218.5.camel@whiteair>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
I see the same drop on my machines,  no raid, but do use drbd.
3x's slower

Brock Palen
Center for Advanced Computing
brockp@xxxxxxxxx
(734)936-1985


On Jan 24, 2008, at 5:36 PM, Sami Dalouche wrote:

Hi,

Can you guys tell me how much slower your Disk I/O performance is using
Xen, compared to native performance ?

On my RAID 5 machine, using Ubuntu feisty's
linux-ubuntu-modules-2.6.22-14-xen kernel, xen 3.1, LVM disks, read and
writes to the disk are something between 2 and 3 times slower.

Is that considered normal, or especially bad ? If it's worse than the
average, what kind of information do you want me to give you to diagnose
the problem ?

Thanks for your help,
Sami Dalouche


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users




_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users