From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Roedel, Joerg" Subject: Re: [PATCH 3/3] Add svm cpuid features Date: Thu, 16 Sep 2010 16:35:50 +0200 Message-ID: <20100916143549.GD7972@amd.com> References: <1284479530-4748-1-git-send-email-joerg.roedel@amd.com> <1284479530-4748-4-git-send-email-joerg.roedel@amd.com> <4C922478.7010703@redhat.com> <20100916141259.GA7972@amd.com> <4C9226E5.4080906@suse.de> <20100916142628.GC7972@amd.com> <4C922971.2020408@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Cc: Avi Kivity , Marcelo Tosatti , "kvm@vger.kernel.org" , "qemu-devel@nongnu.org" To: Alexander Graf Return-path: Received: from va3ehsobe006.messaging.microsoft.com ([216.32.180.16]:19414 "EHLO VA3EHSOBE008.bigfish.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751413Ab0IPOit (ORCPT ); Thu, 16 Sep 2010 10:38:49 -0400 Content-Disposition: inline In-Reply-To: <4C922971.2020408@suse.de> Sender: kvm-owner@vger.kernel.org List-ID: On Thu, Sep 16, 2010 at 10:28:01AM -0400, Alexander Graf wrote: > Roedel, Joerg wrote: > > I'll remove it then. It would have been nice to have it there because it > > will improve performance of svm emulation. But if it is about emulating > > the real cpu then I'll just drop it. > > speed == -cpu host :). If the performance increase is significant, we > can always add a new cpu type for a cpu that does support those flags so > people can use it there and still be migration safe. In fact, that would > even benefit you guys as you'd sell more new machines for speed ;). Well, since its emulated completly in software it would be available on all hosts that start with -cpu phenom (at least if they use the same kvm version). So this would not break migration. Joerg -- AMD Operating System Research Center Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach General Managers: Alberto Bozzo, Andrew Bowd Registration: Dornach, Landkr. Muenchen; Registerger. Muenchen, HRB Nr. 43632