Xen users - Feb 2012 - Are stubdoms still useful for HVM guests that have PV drivers installed?

I''ve been reading this link:

http://www.xen.org/files/xensummitboston08/SamThibault_XenSummit.pdf

And from what I understand is it offloads I/O to a mini domain which
may have more resources assigned to it so
it should improve performance.  Comments suggest that it is designed
for HVM guests not PV guests.

So if you have a Windows HVM guest running that is using the GPLPV
drivers, does this make stubdom unnecessary?

To: xen-users@xxxxxxxxxxxxxxxxxxx
From: Matthew Hook <matthew.hook@xxxxxxxx>
Date: Fri, 17 Feb 2012 11:38:08 -0800
Delivery-date: Fri, 17 Feb 2012 19:46:00 +0000
List-id: Xen user discussion <xen-users.lists.xensource.com>
> 
> I''ve been reading this link:
> 
> http://www.xen.org/files/xensummitboston08/SamThibault_XenSummit.pdf
> 
> And from what I understand is it offloads I/O to a mini domain which
> may have more resources assigned to it so
> it should improve performance.  Comments suggest that it is designed
> for HVM guests not PV guests.
> 
> So if you have a Windows HVM guest running that is using the GPLPV
> drivers, does this make stubdom unnecessary?
Sorry about the top-post. I''m not subscribed, and the new mailing list
wiki
makes it impossible to guess OP addresses.

However, this is exactly what my recent post ''[Xen-users] Problems with
stubdoms, and xl'' is about. The short answer is yes, there is no speed 
improvement. See the last half of Ian''s answer to me, that covers this
point.

Pls cc: me if you need more input.

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