From mboxrd@z Thu Jan 1 00:00:00 1970 From: Teo En Ming Subject: [Xen VGA Passthrough] Performance of AMD Radeon HD 6450 in Windows 7 HVM domU Poorer Than in Bare-Metal Windows 8.1 OS Date: Tue, 09 Sep 2014 23:38:41 +0800 Message-ID: <540F1F01.9090809@gmail.com> Reply-To: singapore.mr.teo.en.ming@gmail.com Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "xen-devel@lists.xen.org" , Kelly.Zytaruk@amd.com, "Teo En Ming (Zhang Enming)" List-Id: xen-devel@lists.xenproject.org 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