[Xen-users] Graphics Pass-Through and domU Memory

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Hey, Folks,
I know I've posted this question before and have not really received a
response, but I'm continuing to experience some problems with graphics
pass through related to the amount of memory assigned to a domU.  I have
an HVM domU, running Windows 7.  My physical platform is a Dell Optiplex
790 with 8GB and 16GB of RAM.  I've also experienced similar issues on
the Dell Optiplex 780 with 8GB of RAM.

At this point I've determined that the limit of the memory I can assign
to the domU with graphics pass-through is 3266 MB.  If I assign any more
than that - 3267, 3270, 4096, and up - I start to see problems.  In
earlier versions of Xen the domU will not start at all.  In the version
I'm running, now, 4.1.2, the domU will start but Windows blue-screens
with a variety of errors, from service problems to attempts to write to
read-only memory.

I'm wondering if anyone can shed any light on why I would be running
into a problem at 3267MB of RAM and any possible things to try to get
around that.  I've played with the videoram and shadow_memory settings,
to no avail.

Thanks!
-Nick



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