From: Markus Armbruster <armbru@redhat.com>
To: Pat Campbell <plc@novell.com>
Cc: Derek Murray <Derek.Murray@cl.cam.ac.uk>,
Xen Development Mailing List <xen-devel@lists.xensource.com>,
Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: Re: userspace block backend / gntdev problems
Date: Sat, 26 Jan 2008 09:41:25 +0100 [thread overview]
Message-ID: <8763xhf07e.fsf@pike.pond.sub.org> (raw)
In-Reply-To: <479A70F7.7080405@novell.com> (Pat Campbell's message of "Fri\, 25 Jan 2008 16\:29\:59 -0700")
Pat Campbell <plc@novell.com> writes:
[...]
> In my latest post on "Dynamic modes support for PV xenfb" I am using
> grants to map an extended framebuffer. I have a single grant ref that
> points to 10 other refs. The other refs contain MFNs. Same technique as
> the current framebuffer pd array but avoids the 64bit long issue. Kind
> of a hybrid approach. I am able to map a 22MB framebuffer when running a
> 64 bit guest and 44MB when running a 32 bit guest. When the backend is
> done with the mapping it sends a message to the frontend to free up the
> refs.
Uhm, I fear I didn't get the advantage of your hybrid approach. Could
you explain?
> I did try to map the whole framebuffers via grants, failed. Like you say
> you need a whole bunch of them.
next prev parent reply other threads:[~2008-01-26 8:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-04 13:48 userspace block backend / gntdev problems Gerd Hoffmann
2008-01-04 14:50 ` Derek Murray
2008-01-04 15:24 ` Gerd Hoffmann
2008-01-21 18:41 ` Markus Armbruster
2008-01-25 23:29 ` Pat Campbell
2008-01-26 8:41 ` Markus Armbruster [this message]
2008-01-26 8:48 ` Keir Fraser
2008-01-28 0:40 ` Pat Campbell
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