Re: [Xen-users] Xen VGA Passthrough - GTX 480 successfully quadrified to quadro 6000 (softmod) - more than 4GB of RAM for Win XP 64 Bits

[David TECHER <davidtecher@xxxxxxxx>]

First time I used 'nvflash --straps' I just changed my (or mask 0) value. So only one hex value was updated!

After that I played Crysis. Crysis crashed at startup

2nd time I reused the command 'nvflash --straps' setting (or mask 1) value to its new value.  It fixed the problem for Crysis

I should be able to do a few tests for Linux when I am back to home.

---

De : Gordan Bobic <gordan@xxxxxxxxxx>
À : David TECHER <davidtecher@xxxxxxxx>
Cc : xen-users@xxxxxxxxxxxxx
Envoyé le : Mercredi 18 septembre 2013 16h50
Objet : Re: [Xen-users] Xen VGA Passthrough - GTX 480 successfully quadrified to quadro 6000 (softmod) - more than 4GB of RAM for Win XP 64 Bits

On Wed, 18 Sep 2013 15:35:44 +0100 (BST), David TECHER
<davidtecher@xxxxxxxx> wrote:
>>Can you just clarify something here - you got the GTX480 to work
>  >with secondary passthrough on a VM with GeForce drivers BEFORE you
>  >modified it into a Quadro? Or am I misunderstanding this?
>
>  No I was not able to do that.

In that case:

1) What modification had you already applied when Crysis crashed at
startup?
2) What further modification was required to fix the problem?

> For temperature problem:
>
> - VM = Windows XP, Windows 7. There is no temperature problem while
> playing native Windows games. I played Crysis 2 and no temperature
> problem.
>
> - VM = Linux. This issue occured with this card when playing native
> Windows games using Wine.
>
> So it occured only for Linux (VM)

Aha! Now I understand! So either the fan control in Linux is broken
or the Windows driver does some temperature management throttling
that the Linux driver doesn't. Have you tried manually setting
the fan speed to maximum? I could have sworn there were Linux
utilities for this ages ago, but I haven't really kept up with
things because I haven't looked into it recently.

What temperature were you hitting on the GPU? IIRC Nvidia GPUs
are rated to 95C, and only throttle after that (or at least that
was the case back when I was running number-crunching on multiple
9800GX2 cards.

Gordan

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