From mboxrd@z Thu Jan 1 00:00:00 1970 From: Teo En Ming Subject: Re: [Xen VGA Passthrough] Performance of AMD Radeon HD 6450 in Windows 7 HVM domU Poorer Than in Bare-Metal Windows 8.1 OS Date: Wed, 10 Sep 2014 00:51:20 +0800 Message-ID: <540F3008.60200@gmail.com> References: <540F1F01.9090809@gmail.com> <2158b5e0c984dca9c21885c952d09cd5@mail.shatteredsilicon.net> 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: In-Reply-To: <2158b5e0c984dca9c21885c952d09cd5@mail.shatteredsilicon.net> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: Gordan Bobic , "xen-devel@lists.xen.org" , "Teo En Ming (Zhang Enming)" List-Id: xen-devel@lists.xenproject.org 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. > > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xen.org > http://lists.xen.org/xen-devel > -- Yours sincerely, Teo En Ming