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

["Zytaruk, Kelly" <Kelly.Zytaruk@xxxxxxx>]

Hi Teo,

It is difficult to compare scores between Win7 running in DomU and Win8.1 
running on bare metal.  A more comprehensive comparison would be to compare 
Win7 in DomU versus Win7 on bare metal.

I currently test with 3DMark11 version 1.0.132.0.  I will download a copy of 
1.3.708 and see what kind of results I get.

I had a quick look at the scores and as you mention, there is a significant 
difference.  What driver are you using for Win8.1 as I see the results showing 
"Graphics driver is not approved".

It would also be useful to know which version of Xen and Linux you are using.

While I will try to help you as much as I can, we also have a user forum at 
forums.amd.com where you can speak with others that may have seen the same 
issues as you. This forum is also monitored by our customer support team and 
they would very much like to hear your feedback.

Thanks,
Kelly

> -----Original Message-----
> From: Teo En Ming [mailto:singapore.mr.teo.en.ming@xxxxxxxxx]
> Sent: Tuesday, September 09, 2014 11:39 AM
> To: xen-devel@xxxxxxxxxxxxx; Zytaruk, Kelly; Teo En Ming (Zhang Enming)
> Subject: [Xen VGA Passthrough] Performance of AMD Radeon HD 6450 in
> Windows 7 HVM domU Poorer Than in Bare-Metal Windows 8.1 OS
> 
> 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.
> 
> --
> Yours sincerely,
> 
> Teo En Ming
> Singapore

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