Re: [Xen-users] [Xen VGA Passthrough] AMD R9 290X GPU???

[Peter Kay <syllopsium@xxxxxxxxxxxxxxxx>]

On 13 September 2014 12:37, Gordan Bobic <gordan@xxxxxxxxxx> wrote:

On 2014-09-12 15:24, Peter Kay wrote:

On 12 September 2014 14:46, Gordan Bobic <gordan@xxxxxxxxxx> wrote:

GT630 causes the system to lock-up about 80% of the time as soon
as Xorg starts. Same driver, same configuration. I am at a loss
to explain it.

Yes, it was only with a GT210. I'd have to double check if it was specific to using the NVidia driver and if it was a KVM only issue.

Yes. It's solid.

Are you using a kernel that implements the bus reset to reset
the card? Or is KVM capable of side-loading the GPU BIOS and
re-POST-ing that for recent ATI cards (with VBIOS > 64KB)?

KVM is capable of side loading the GPU BIOS, yes. For some people this is not required, but when I tried it, it was.

Â

Last time I tested Xen was somewhat faster than KVM. I would
have preferred to use KVM because unlike the Xen dom0, with
KVM the host domain isn't running as a virtual domain which
has performance and driver compatibility benefits for the host
domain.

I think the benchmarks differ but show KVM having a bit of an edge. I
prefer the manageability of Xen. KVM is currently better at hot plug.

Neither of those aspects are particularly important to me, I just
need the guests to be stable and work properly with GPU passthrough,
and survive a reboot every week or two when Windows decides it needs
a reboot to apply the patches, without having to reboot the host.

Are you still running a PCIe 1.1 system? Or are you using a GPU that
is PCIe 1.1? IIRC most PCIe motherboards and devices since circa 2008
are PCIe 2.0+.

The former, yes - an upgrade would be a good idea but I'm stubborn in getting this to work first. The 6950 is a PCI-e 2.0 card.

Technically the 3210 chipset is based on the X38 (PCI-e 2.0) chipset, but for reasons known only to Intel, all the slots are PCI-e 1.x...Â

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