From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758100AbZEHH5V (ORCPT ); Fri, 8 May 2009 03:57:21 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752805AbZEHH5G (ORCPT ); Fri, 8 May 2009 03:57:06 -0400 Received: from mx2.redhat.com ([66.187.237.31]:58043 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751057AbZEHH5E (ORCPT ); Fri, 8 May 2009 03:57:04 -0400 Message-ID: <4A03E579.8030201@redhat.com> Date: Fri, 08 May 2009 10:55:37 +0300 From: Avi Kivity User-Agent: Thunderbird 2.0.0.21 (X11/20090320) MIME-Version: 1.0 To: Marcelo Tosatti CC: Gregory Haskins , Chris Wright , Gregory Haskins , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Anthony Liguori Subject: Re: [RFC PATCH 0/3] generic hypercall support References: <4A0041BA.6060106@novell.com> <4A004676.4050604@redhat.com> <4A0049CD.3080003@gmail.com> <20090505231718.GT3036@sequoia.sous-sol.org> <4A010927.6020207@novell.com> <20090506072212.GV3036@sequoia.sous-sol.org> <4A018DF2.6010301@novell.com> <20090506160712.GW3036@sequoia.sous-sol.org> <4A031471.7000406@novell.com> <20090507233503.GA9103@amt.cnet> <20090507234311.GA9517@amt.cnet> In-Reply-To: <20090507234311.GA9517@amt.cnet> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Marcelo Tosatti wrote: > Also it would be interesting to see the MMIO comparison with EPT/NPT, > it probably sucks much less than what you're seeing. > Why would NPT improve mmio? If anything, it would be worse, since the processor has to do the nested walk. Of course, these are newer machines, so the absolute results as well as the difference will be smaller. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.