Re: [Xen-users] High CPU utilization on converted domU's

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

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.

Regards,

Fajar

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