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Working with assumptions since the information you provided isn't entirely clear. You are running Windows 7 as an HVM and using IOMMU/Passthrough with your AMD Radeon 6850?

Did you install Xen from packages, or compile it? How about your Dom0 kernel?

I agree entirely about using the right tool for the job, but I have to disagree in that I run a Windows 7 HVM and can play a large number of games at native performance.

Running Debian Wheezy with custom kernel for built-in pciback, Xen 4.2 compiled from source, and an AMD 6870, scores a 7.8/7.9 in Windows Experience Index. Apples to Oranges with the CPU though, I'm using an i7 2600 and passing 4 vcores (my low WEI score is 7.5 for CPU).

Still, haven't had any problems playing games at max settings, if your card isn't performing right I'd assume either improper configuration or maybe the card isn't being reset. Have you looked up problems regarding performance degradation on HVM reboots? You may have to manually eject the card, or reboot the entire physical machine for the card to reset and perform normally.

On Sun, Aug 26, 2012 at 4:37 AM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:

On Sun, Aug 26, 2012 at 2:21 PM, Stanley Tweedle <darkshvein@xxxxxxxxx> wrote:
> Hi, all.
> I have some ideas and questions about topic.
> Gossip: 3d marks test and games results more above than under wine, but as
> far from native win.
> How I can to accelerate it?
> I tried leave only one CPU(of 4) for Debian-Domain-0, it take very little
> performance growth.
> Will useful recompile kernel with bigger/smaller timer? I not sure about
> tickless timer...
> Overclocking in individual cases has no results, such as GTA4.
> And crazy suggestion: my second card is nvidia geforce with CUDA. It is
> possible to use CUDA/card for speed up VM's? Such as SLI...
>
> Any advices, exclude to buy faster hardware? (:

Instead of trying random stuff, I'd suggest you just use the right
tool for the job.

What do you mainly use your PC for? If it's mainly windows gaming,
then just use native windows, possibly with virtualbox or whatever to
run linux VMs. No current virtualization solution will come near
native performance for games.

--
Fajar

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Re: [Xen-users] Windows gaming speed up