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] High CPU utilization on converted domU's

To: Xen List <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] High CPU utilization on converted domU's
From: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Date: Fri, 24 Apr 2009 09:49:23 +0700
Delivery-date: Thu, 23 Apr 2009 19:50:03 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1240501635.26249.270.camel@xxxxxxxxxxxxxxxxxxxxxxxx>
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: <1240501635.26249.270.camel@xxxxxxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
On Thu, Apr 23, 2009 at 10:47 PM, James Pifer <jep@xxxxxxxxxxxxxxxx> wrote:
> I have a few domU's that have been converted from standalone servers.
> They are Windows 2000 servers.

How do you convert them? In general I find it easier to simply install
from stratch.

> They run fine except for the CPU
> utilization in xen. virt-manager shows 100% cou for the domU even though
> inside the domU the CPU is 99% idle  according to Windows Task Manager.
> These domUs are running off image files. Any suggestions or settings I
> should try?

>    (online_vcpus 2)

>            (pae 1)
>            (acpi 1)
>            (apic 1)

If I remember correctly, using standard PC HAL with 1 CPU usually
leads to better performance compared to ACPI HAL. Changing HAL is
somewhat tricky though, so I'd suggest you try a fresh install first
with cpus=1, pae=0, acpi=0, apic=0. If that works then you can modify
your current domU.

As a side note, I don't know of any Windows PV driver for Windows
2000, so I/O performance (both network and disk) would be somewhat
dissappointing on that OS. Depending on your needs, that might or
might not be acceptable.
For higher I/O performance, you might want to try :
- using Windows 2003, plus GPLPV, or
- upgrade to Xen 3.3, and see if stubdom can help.



Xen-users mailing list

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