From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992782AbXDDJ0N (ORCPT ); Wed, 4 Apr 2007 05:26:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992785AbXDDJ0N (ORCPT ); Wed, 4 Apr 2007 05:26:13 -0400 Received: from gw.goop.org ([64.81.55.164]:55846 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992782AbXDDJ0L (ORCPT ); Wed, 4 Apr 2007 05:26:11 -0400 Message-ID: <46136F25.7030907@goop.org> Date: Wed, 04 Apr 2007 02:25:57 -0700 From: Jeremy Fitzhardinge User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Andi Kleen CC: Andrew Morton , virtualization@lists.osdl.org, lkml , Ingo Molnar Subject: Re: [patch 04/17] Add pagetable accessors to pack and unpack pagetable entries References: <20070402055652.610711908@goop.org> <20070402055704.278590661@goop.org> <200704020812.18320.ak@suse.de> In-Reply-To: <200704020812.18320.ak@suse.de> Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Andi Kleen wrote: > What do the benchmarks say with CONFIG_PARAVIRT on native hardware > compared to !CONFIG_PARAVIRT. e.g. does lmbench suffer? Barely. There's a slight hit for not using patching, and patching is almost identical to native performance. The most noticeable difference is in the null syscall microbenchmark, but once you get to complex things the difference is in the noise. Processor, Processes - times in microseconds - smaller is better ------------------------------------------------------------------------------ Host OS Mhz null null open slct sig sig fork exec sh call I/O stat clos TCP inst hndl proc proc proc --------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- non-paravirt ezr Linux 2.6.21- 1000 0.25 0.52 31.6 34.7 10.3 1.03 5.31 726. 1565 4520 ezr Linux 2.6.21- 1000 0.25 0.52 31.8 34.7 12.6 1.03 5.41 725. 1564 4585 ezr Linux 2.6.21- 1000 0.25 0.55 31.7 34.5 11.8 1.02 5.47 720. 1595 4518 paravirt, no patching ezr Linux 2.6.21- 1000 0.28 0.55 31.3 34.3 10.0 1.05 5.56 747. 1621 4675 ezr Linux 2.6.21- 1000 0.28 0.56 31.5 34.3 12.9 1.05 5.66 755. 1629 4684 ezr Linux 2.6.21- 1000 0.28 0.55 31.8 34.5 12.5 1.05 5.45 747. 1622 4695 paravirt, patching ezr Linux 2.6.21- 1000 0.25 0.53 31.8 34.4 10.1 1.04 5.44 730. 1583 4600 ezr Linux 2.6.21- 1000 0.26 0.55 32.1 35.2 13.3 1.03 5.48 748. 1589 4606 ezr Linux 2.6.21- 1000 0.26 0.54 32.0 34.9 14.1 1.04 5.43 752. 1606 4647 J