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/
Home Products Support Community News


Re: [Xen-users] Xen Performance

To: Amir Maqbool Ahmed <AmirM.Ahmed@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] Xen Performance
From: "Olivier B." <xen.list@xxxxxxxxx>
Date: Tue, 26 May 2009 16:21:27 +0200
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 26 May 2009 07:35:31 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <E1M8Agp-000247-7j@xxxxxxxxxxxxxxxxxxxxxxx>
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/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <E1M8Agp-000247-7j@xxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla-Thunderbird (X11/20090103)

are you comparing a Xen mounted on LVM with a "normal" FS not mounted on LVM ?
As LVM disable barrier, there can be a performance improvement.


Amir Maqbool Ahmed a écrit :
Hi I am a student at the University College of Oslo and have in one experiment tried to test the performance of Xenolinux compared to Native linux on Debian lenny 2.6.26-2 kernel.
bonnie++ the disk IO bechmark program was used among other tests like cpu 
intensive scripts.
The goal is to prove the statement (Once again) that Xen adds only an overhead 
of maximum 8%.

The Results of bonnie++ have been surprizing and I want to explain them. It shows that for some types of Disk IO, like sequential delete and random create
Xen performs faster than native linux. A full comparison chart is attached as a 
The test are run first from native linux than both from Dom0 and a DomU with 
the same results.

Can you please help me understand these results, How can Xenolinux perform faster although only for some types of operations, then native linux?

Plese forgive me If Im missing something completely obvious. If you need any further info. please just send me an email and it will be provided.

Hope to hear from you soon
Amir Ahmed

Xen-users mailing list

Xen-users mailing list

<Prev in Thread] Current Thread [Next in Thread>