Re: [Xen-users] Help on setting up a PVM

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

On Fri, Jan 30, 2009 at 2:48 AM, edu gargiulo <egargiulo+lists@xxxxxxxxx> wrote:
> I'm going to set up a PVM on xen-3.3.1 debian-amd64. I need advices
> about the best methods to install a fresh debian on it (i.e. how to
> choose the kernel for pvm) . I've installed xen from sources and only
> have one xen kernel in /boot which I'm using for dom0; should I use
> the same kernel for domUs?

You can, but if you do you also need to copy
/lib/modules/<kernel-version> directory from dom0 to domU as well. I'd
recommend you use the kernel located on domU. In domU's config file
use pygrub as bootloader and install xenified-kernel (on RHEL this
would be kernel-xen) on domU.

> There is any problem on use vcpus=2; the other vm is an hvm running
> winxp and I would like to know if using 1 or 2 vcpus on the new pvm
> will slowdown the hvm.
>

Sort of, depends on what you use.
If it's HVM Windows guest, then most likely yes. To be more accurate,
you need PV drivers (the one widely used is James Harper's Xen PV
Driver) in HVM Windows guest to get a decent performance. Last time I
check, it's network performance drops when using CPU > 1. It's still
over 500 Mbps though (vs over 1 Gbps when using 1 CPU), so depending
on what you use it for it might be acceptable.

Regards,

Fajar

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