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RE: [Xen-devel] can't create any more pv-on-hvm domains after~38under 3.

To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, "Jan Beulich" <jbeulich@xxxxxxxxxx>
Subject: RE: [Xen-devel] can't create any more pv-on-hvm domains after~38under 3.3-testing
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Wed, 3 Dec 2008 22:27:25 +1100
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Thread-topic: [Xen-devel] can't create any more pv-on-hvm domains after~38under 3.3-testing
> On 03/12/2008 10:51, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
wrote:
> 
> > And so on up until domain 35 which is the last one I was able to
> > create... none of those domains exist anymore, but when they did
exist
> > they were all x32 HVM domains running Windows 2003 x32. Xen and Dom0
are
> > both amd64.
> 
> Looks like each domain has one outstanding write reference remaining
to a
> data page. Usually that's a backend driver or daemon in dom0 not
releasing
> a mapping.
> 

Well... assuming that I'm the only one reporting this problem, I wonder
if the problem is related to the pvscsi stuff I've been testing. It's
likely that my drivers aren't releasing resources at shutdown in the
same way as the linux scsifront drivers (or at all...), so it could be
something that wouldn't otherwise show up.

Alternatively it could be a combination of the gplpv drivers and netback
or blkback. I'm pretty sure that I had the problem before I started
testing pvscsi...

The machine I am testing on will be busy for the rest of the night, but
tomorrow I'll do some testing and see what happens, unless you can
suggest a way I could discover what those pages belong to in the
meantime?

Thanks

James

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