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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



On 09/09/2014 23:49, Gordan Bobic wrote:
Did you test this on a fresh dom0 reboot, i.e. first domU boot
after dom0 reboot?

Yes.


Also, how many VCPUs do you have in the domU vs. total in the
machine?

I have 4 VCPUs in the domU and 4 cores 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.

How do I do that?

Then start up Xen, limit dom0 to 2 cores, give 2 cores to domU,
test and compare.

4 cores were automatically assigned to dom0. I gave 4 cores to domU as well.

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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--
Yours sincerely,

Teo En Ming


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