From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: question on #UD emulation Date: Sun, 16 Dec 2007 17:04:56 +0200 Message-ID: <47653E98.6040403@qumranet.com> References: <10EA09EFD8728347A513008B6B0DA77A02858E27@pdsmsx411.ccr.corp.intel.com><47650CD8.5060401@qumranet.com><20071216123318.GB31298@amd.com> <47651EDB.2010601@qumranet.com> <10EA09EFD8728347A513008B6B0DA77A02858E8C@pdsmsx411.ccr.corp.intel.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0899642533==" Cc: kvm-devel To: "Dong, Eddie" Return-path: In-Reply-To: <10EA09EFD8728347A513008B6B0DA77A02858E8C-wq7ZOvIWXbNpB2pF5aRoyrfspsVTdybXVpNB7YpNyf8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org --===============0899642533== Content-Type: text/plain; charset=GB2312 Content-Transfer-Encoding: 7bit Dong, Eddie wrote: > A little bit suspicion for the usage model too :( > The CPUID feature list can't be changed dynamically, so I doutb > if a real user will give up performance at beginning when he/she > starts the guest for "maybe" future migration cross host platform. > > A VT or SVM enabled machine usually has many features > which doesn't exist in the common feature list for both Intel & AMD, > such as MMX/SSE2/SSE3. So the performance penalty could be big. > mmx/sse2/sse3 are actually common across intel/amd; the performance difference should be minor (well, depending on the workload). -- error compiling committee.c: too many arguments to function --===============0899642533== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline ------------------------------------------------------------------------- SF.Net email is sponsored by: Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace --===============0899642533== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ kvm-devel mailing list kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org https://lists.sourceforge.net/lists/listinfo/kvm-devel --===============0899642533==--