Re: [Xen-users] VGA Passthrough attempted with an Nvidia GTX970

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 2015-02-12 09:19, Peter Kay wrote:
> On 12 February 2015 08:40:35 GMT+00:00, Gordan Bobic 
> <gordan@xxxxxxxxxx> wrote:
> > On 2015-02-12 04:58, jacek burghardt wrote:
> > > Did you try to assign more memory to win guest ? I would try with 4gb
> > That is not great advice - there are hardware and BIOS bugs that
> > can cause problems with more than between 1GB and 3GB of RAM passed
> > through (e.g. any hardware with NF200 PCIe bridges).
> Adding more memory is very unlikely to help, but might work once the
> configuration is proven.
Of course - once you have it working reliably, crank it up as much
as you need, but until you have it at least showing output on the
external monitor it's a good idea to start with 1GB.

> I'd start with 1GB until it's fine. I get the
> impression NF200 bridges are less common these days.
They are (thankfully), but I would not want to bet that similar
bugs don't lurk elsewhere. Start with baby steps until you have
confidence in your hardware. :)

> I'd also note that whilst it's generally true that Quadros are not
> cheap and that many that are do not have MultiOS enabled. However,
> this is not universally true, an FX3800 or FX4800 are not unreasonably
> priced if you get them second hand on ebay.
Of course. I find Quadro 2000 is very good value for testing. I bought
one for about Â90 2 years ago, and have been keeping it on the shelf
ever since for testing new hardware with. Last I checked the price
on them has nearly halved on those since I bought it.

I've just ordered an
> FX3800 after (unsurprisingly) failing to get a Radeon 6450 passing
> through from FreeBSD - I need a single slot card. It wasn't
> appreciably cheaper to find a model I could flash a BIOS on to, like I
> did with the GTX480 to Quadro 6000 mod.
Yeah, I use modded cards. GTX480 is still pretty awesome value
for virtualized gaming.

You might want to look into a Quadro 2000 next time, it is a
single slot card and they are quite cheap now (same spec as a
GTS450).



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