Re: [Xen-devel] [Xen VGA Passthrough] Performance of AMD Radeon HD 6450 in Windows 7 HVM domU Poorer Than in Bare-Metal Windows 8.1 OS

[Gordan Bobic <gordan@xxxxxxxxxx>]

Did you test this on a fresh dom0 reboot, i.e. first domU boot
after dom0 reboot?

Also, how many VCPUs do you have in the domU vs. total in the
machine? Can you test bare metal with CPUs disabled? For example,
if you have a quad core CPU, disable 2 cores, test bare metal.
Then start up Xen, limit dom0 to 2 cores, give 2 cores to domU,
test and compare. Also make sure you test with the same OS in
domU and native otherwise you are not really making a meaningful
comparison.

Gordan

On 2014-09-09 16:38, Teo En Ming wrote:
> Hi,
>
> I have got VGA Passthrough working with AMD Radeon HD 6450.
>
> However, the performance of AMD Radeon HD 6450 in Windows 7 HVM domU
> is poorer than in bare-metal Windows 8.1 operating system. Please
> refer to the 3dmark basic edition 1.3.708 scores for AMD Radeon HD
> 6450 in both Windows 7 HVM domU and bare-metal Windows 8.1.
>
> 3dmark scores for Windows 7 HVM domU:
>
> http://www.3dmark.com/3dm/3995208
>
> 3dmark scores for bare-metal Windows 8.1:
>
> http://www.3dmark.com/3dm/3996885
>
> Why is there such a great disparity in 3dmark scores for AMD Radeon HD
> 6450 in Windows 7 HVM domU and in bare-metal Windows 8.1?
>
> The performance of AMD Radeon HD 6450 in Windows 7 HVM domU is not
> even near native.
>
> Is it possible for developers to improve the performance of AMD Radeon
> HD 6450 in Windows HVM virtual machines?
>
> Thank you very much.
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