Re: [Xen-users] VGA passthrough with Xen 4.3 and xl toolstack - performance degradation resolved?

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 03/12/2014 06:21 PM, David Sutton wrote:
> On Wed, Mar 12, 2014 at 12:57 PM, H. Sieger <powerhouse.linux@xxxxxxxxx
> <mailto:powerhouse.linux@xxxxxxxxx>> wrote:
>
>     I'm referring to secondary passthrough. What you are saying here is
>     quite a surprise to me. A number of people have reported successful
>     VGA passthrough using ATI cards, see Post your Passmark results of
>     your Windows VM
>     <http://forums.linuxmint.com/viewtopic.php?f=225&t=153482> and
>     HOW-TO make dual-boot obsolete using XEN VGA passthrough
>     <http://forums.linuxmint.com/viewtopic.php?f=42&t=112013>, or
>     http://www.overclock.net/t/1205216/guide-create-a-gaming-virtual-machine.
>     Since I wrote the "how-to make dual-boot obsolete..." more than a
>     year and a half ago, with regular updates, I never ever saw a user
>     mention guest reboot/performance issues, nor did I receive private
>     notes on that.
>
> The initial passthrough is never really an issue, its when you have to
> restart the domU (for example, after a Windows Update) that the
> complications occur - at least that was the experience I had with both a
> 6770 and a 7750, passing through to a Windows 7 domU. I've had multiple
> people ask me about the degraded performance after a reboot, which is
> why the Arch Linux package has a copy of the primary passthrough patch
> included with it (but disabled, with the understanding that a user can
> enable it if they wish but its not supported in any fashion)
Indeed, exactly this - initial passthrough works, but once you need to 
reboot the domU it all falls apart pretty quickly.
Gordan


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