From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992780AbXCCADN (ORCPT ); Fri, 2 Mar 2007 19:03:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992781AbXCCADN (ORCPT ); Fri, 2 Mar 2007 19:03:13 -0500 Received: from mga05.intel.com ([192.55.52.89]:44917 "EHLO fmsmga101.fm.intel.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2992780AbXCCADM (ORCPT ); Fri, 2 Mar 2007 19:03:12 -0500 X-ExtLoop1: 1 X-IronPort-AV: i="4.14,244,1170662400"; d="scan'208"; a="206146772:sNHT22093120" Subject: Re: system call time increase when turning on CONFIG_PARAVIRT From: Tim Chen Reply-To: tim.c.chen@linux.intel.com To: Jeremy Fitzhardinge Cc: linux-kernel@vger.kernel.org, Virtualization Mailing List In-Reply-To: <45E89CFB.4090905@goop.org> References: <1172866274.4898.14.camel@localhost.localdomain> <45E89CFB.4090905@goop.org> Content-Type: text/plain Organization: Intel Date: Fri, 02 Mar 2007 15:11:51 -0800 Message-Id: <1172877111.8383.4.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-8) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2007-03-02 at 13:54 -0800, Jeremy Fitzhardinge wrote: > [ I assume you're talking about running on native hardware. ] > That's correct. > I haven't done any detailed measurements on what effect this will have, > but it does bring the actual executed instruction stream much closer to > the !CONFIG_PARAVIRT case, and so I would hope it would recover most or > all of the performance loss you've noticed. > I also hope that the performance can be recovered as this option could enabled in distributions' kernels in future. Tim