Re: [Xen-devel] Some trouble to use NVIDIA CUDA with Xen

[Martin Cerveny <martin@xxxxxxxxx>]

Hello.

On Mon, 12 Aug 2013, Konrad Rzeszutek Wilk wrote:
> On Mon, Aug 12, 2013 at 01:33:13PM +0100, Gordan Bobic wrote:
> > Your Nvidia device ID seems to imply a GTX770.
> > I could be wrong, but wasn't this only supported on Quadro/Grid GPUs?
> > Or is that limitation only applicable to Windows?
I did not try to use it in "multios" (domU) environment (only simple Dom0).

> > > > NVRM: PAT configuration unsupported.
> Right, so there are couple of patches that can enable that back.
>
> You need to revert these two:
> 8eaffa67b43e99ae581622c5133e20b0f48bcef1
> c79c49826270b8b0061b2fca840fc3f013c8a78a
>
> And apply this patch:
>
> https://lkml.org/lkml/2012/2/10/229
>
> That should re-enable PAT.  Try that and please report back.
I applied the patch to 3.9.11-200.PAT.fc18.x86_64 (3.10 is not working due 
to incompatibilities with nvidia driver source code).
Error persists:
"NVRM: PAT configuration unsupported."

There is one progress at least.
The tested programs are working in "normal speed" (as without Xen)
- speedup 20x to compare with non-patched kernel on Dom0.

The CUDA error still persists:

---
# /usr/bin/time ./bandwidthTest
[CUDA Bandwidth Test] - Starting...
Running on...

 Device 0: GeForce GTX 770
 Quick Mode

CUDA error at bandwidthTest.cu:719 code=46(cudaErrorDevicesUnavailable) 
"cudaEventCreate(&start)"
0.00user 0.20system 0:00.26elapsed 79%CPU (0avgtext+0avgdata 5236maxresident)k
0inputs+0outputs (0major+1182minor)pagefaults 0swaps
---

I reported the problem to NVIDIA too and waiting for solution.

Any other hint ?

Thanks, Martin Cerveny

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