[kernel-xen] xen-pciback in 3.9.x

[Gordan Bobic]

On 05/12/2013 08:40 PM, povder wrote:
> Hi again
>
> I configured my system to work with xen-pciback as a module. Now I
> didn't have any problems modprobing a module. I'm passing through some
> USB devices and most importantly a VGA card (radeon 4850) as a
> secondary VGA card to my HVM linux guest. I'm making devices
> assignable by xl pci-assignable-add. I'm experiencing a significant
> performance loss of my VGA card when compared to built in xen-pciback.
> Honestly I didn't expect that change to module would impact
> performance. I guess I'll ask on xen-users about it later.

Have you checked that the radeon driver is blacklisted and doesn't get 
loaded before it is detached and stubbed to xen-pciback?

Gordan