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] Disk performance under Xen

To: "Gavin Conway" <gavin.conway@xxxxxxxxxxxxxxxxx>, Pasi Kärkkäinen <pasik@xxxxxx>
Subject: RE: [Xen-users] Disk performance under Xen
From: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
Date: Fri, 31 Jul 2009 07:28:04 -0400
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Fri, 31 Jul 2009 04:30:17 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <F547661C26C5364D9FA0C481D395CCCE259603D120@xxxxxxxxxxxxxxxx>
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: <F547661C26C5364D9FA0C481D395CCCE259603D11F@xxxxxxxxxxxxxxxx><20090731104451.GH24960@xxxxxxxxxxxxxxx> <F547661C26C5364D9FA0C481D395CCCE259603D120@xxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcoRzBkJc2XJZCdMROSigZzxypJGAQAAL8BAAADbQEA=
Thread-topic: [Xen-users] Disk performance under Xen
> -----Original Message-----
> We get the same performance under windows but comparing the difference between
> the two it's easier to demonstrate with 2 x Linux systems. With regards to 
> why we use
> HVM, this is so we can do P2V migrations of various OS' into Xen.

For Linux, a HVM to PV migration shouldn't be a barrier.  Install a pv-ops 
capable kernel in your domU (or 2.6.18 Xen-patched kernel), adjust configs and 
restart the domU.

You can also stick with HVM, but why cripple things?  Wouldn't you rather have 
device hotplug, balloon and fast I/O?

For Windows you can install the GPLPV driver to avoid emulated I/O.  I don't 
know what options exist for any other OS.


Xen-users mailing list

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