From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S968403AbXFHIB5 (ORCPT ); Fri, 8 Jun 2007 04:01:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S938559AbXFHH1J (ORCPT ); Fri, 8 Jun 2007 03:27:09 -0400 Received: from nic.NetDirect.CA ([216.16.235.2]:49425 "EHLO rubicon.netdirect.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S938488AbXFHH1H (ORCPT ); Fri, 8 Jun 2007 03:27:07 -0400 X-Originating-Ip: 72.143.66.27 Date: Fri, 8 Jun 2007 03:25:19 -0400 (EDT) From: "Robert P. J. Day" X-X-Sender: rpjday@localhost.localdomain To: "H. Peter Anvin" cc: William Lee Irwin III , Satyam Sharma , Nick Piggin , Linux Kernel Mailing List , Ralf Baechle Subject: Re: why does the macro "ZERO_PAGE" take an argument? In-Reply-To: <46687598.2040701@zytor.com> Message-ID: References: <4667EC18.4080904@yahoo.com.au> <4668412D.3030506@zytor.com> <20070607192911.GV6909@holomorphy.com> <46687598.2040701@zytor.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Net-Direct-Inc-MailScanner-Information: Please contact the ISP for more information X-Net-Direct-Inc-MailScanner: Found to be clean X-Net-Direct-Inc-MailScanner-SpamCheck: not spam, SpamAssassin (not cached, score=-16.8, required 5, autolearn=not spam, ALL_TRUSTED -1.80, BAYES_00 -15.00, INIT_RECVD_OUR_AUTH -20.00, RCVD_IN_SORBS_DUL 20.00) X-Net-Direct-Inc-MailScanner-From: rpjday@mindspring.com Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 7 Jun 2007, H. Peter Anvin wrote: > William Lee Irwin III wrote: > > Robert P. J. Day wrote: > >>> although it's not clear where in the source tree are the invocations > >>> that would actually make a difference to a MIPS system, which is why > >>> i've CC'ed ralf on this. i'm sure he can clear this up. :-) > > > > On Thu, Jun 07, 2007 at 10:32:29AM -0700, H. Peter Anvin wrote: > >> x86 could also benefit from coloured zeropages. In fact, I thought it > >> already had them (K8 wants as many as 8.) > > > > How would one demonstrate the beneficial effect of such? > > Dean Gaudet at Transmeta did some benchmarking using SPEC. If I > recall his numbers correctly (this is from memory, mind you) on > Transmeta Efficeon, which has 2-way virtual cache tagging with > hardware recovery, zeropage coloring was a 1.5% performance > improvement. and once again, an initially innocuous question quickly leaves me behind. no, no, i'm getting used to it. :-P rday -- ======================================================================== Robert P. J. Day Linux Consulting, Training and Annoying Kernel Pedantry Waterloo, Ontario, CANADA http://fsdev.net/wiki/index.php?title=Main_Page ========================================================================