Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754132AbZA0IYe (ORCPT ); Tue, 27 Jan 2009 03:24:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752202AbZA0IYZ (ORCPT ); Tue, 27 Jan 2009 03:24:25 -0500 Received: from gw.goop.org ([64.81.55.164]:42724 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752145AbZA0IYZ (ORCPT ); Tue, 27 Jan 2009 03:24:25 -0500 Message-ID: <497EC4B6.3060805@goop.org> Date: Tue, 27 Jan 2009 00:24:22 -0800 From: Jeremy Fitzhardinge User-Agent: Thunderbird 2.0.0.19 (X11/20090105) MIME-Version: 1.0 To: Ingo Molnar CC: Zachary Amsden , Nick Piggin , Linux Kernel Mailing List , Linus Torvalds , "hpa@zytor.com" , "jeremy@xensource.com" , "chrisw@sous-sol.org" , "rusty@rustcorp.com.au" , Andrew Morton , Xen-devel Subject: Re: lmbench lat_mmap slowdown with CONFIG_PARAVIRT References: <20090120112634.GA20858@elte.hu> <20090120140324.GA26424@elte.hu> <49763806.5090009@goop.org> <20090120205653.GA19710@elte.hu> <20090121072718.GN24891@wotan.suse.de> <4977A051.8050203@goop.org> <1232663311.16317.176.camel@bodhitayantram.eng.vmware.com> <4978F6C6.3090003@goop.org> <1232664907.16317.182.camel@bodhitayantram.eng.vmware.com> <49790BCC.1040807@goop.org> <20090127075912.GA6551@elte.hu> In-Reply-To: <20090127075912.GA6551@elte.hu> X-Enigmail-Version: 0.95.6 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 Content-Length: 742 Lines: 19 Ingo Molnar wrote: > This is a very serious paravirt_ops slowdown affecting the native kernel's > performance to the tune of 5-10% in certain workloads. > > It's been about 2 years ago that paravirt_ops went upstream, when you told > us that something like this would never happen, that paravirt_ops is > designed so flexibly that it will never hinder the native kernel - and if > it does it will be easy to fix it. Now is the time to fulfill that > promise. > Yep, working on it. J -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/