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

Hi Nick,

Is your Dom0 64bit? Is your Windows7-DomU 64bit?
Do you create your DomU via xm or (better!) with xl?

How many CPUs do you give this DomU?

Does your DomU work ok with <=3266, including GPU support? Or are there 
problems even with fewer than 3266MB Ram?

Sorry, i have no definite answer to your problem, but i recall similar Problems 
with xm-created HVM guests and 64/32bit mixes , especially with older Xen 


Am Mittwoch, 15. Februar 2012, 01:00:02 schrieb Nick Couchman:
> 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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