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

[Teo En Ming <singapore.mr.teo.en.ming@xxxxxxxxx>]

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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> http://lists.xen.org/xen-devel

--
Yours sincerely,

Teo En Ming


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