Re: [Libvir] unsigned long

[John Levon <levon movementarian org>]

On Wed, Sep 12, 2007 at 03:50:23AM +0100, Daniel P. Berrange wrote:

> > Thanks. Mark Johnson pointed out that we get away with a 32-bit
> > virt-install right now simply because the hypercall libvirt backend
> > fails, and falls back to calling into xend. In general this works well,
> > but seems to have at least one issue that means we might need to create
> > a 64-bit virt-{install,manager} ...
> 
> That's odd - to be able to run a 32-bit userspace on 64-bit HV you must
> be running a Xen 3.1  release or later. If using that, then libvirt should

We're using 3.0.4. I believe that virt-install is only using calls that
can be supplied by the xend backend, so the fact that the hypercall
backend doesn't work doesn't matter.

> You really want to be letting libvirt use the HV because for calls such
> as listing guests, getting domain stats we get x100 to x1000 lower overheads
> from talking to the HV instead of XenD. Talking to XenD you'll quickly see

Right. A 3.1 upgrade is planned soon, and we'll probably just do this to
resolve the issue.

regards,
john