Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261528AbVCXSkP (ORCPT ); Thu, 24 Mar 2005 13:40:15 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262650AbVCXSiX (ORCPT ); Thu, 24 Mar 2005 13:38:23 -0500 Received: from palrel13.hp.com ([156.153.255.238]:4024 "EHLO palrel13.hp.com") by vger.kernel.org with ESMTP id S262651AbVCXSel (ORCPT ); Thu, 24 Mar 2005 13:34:41 -0500 From: David Mosberger MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <16963.2075.713737.485070@napali.hpl.hp.com> Date: Thu, 24 Mar 2005 10:34:03 -0800 To: Andi Kleen Cc: Christoph Lameter , Denis Vlasenko , Dave Hansen , Andrew Morton , Linux Kernel Mailing List , Mel Gorman , linux-ia64@vger.kernel.org, Jens.Maurer@gmx.net Subject: Re: [PATCH] add a clear_pages function to clear pages of higher order In-Reply-To: <20050318192808.GB38053@muc.de> References: <200503111008.12134.vda@port.imtp.ilyichevsk.odessa.ua> <200503181154.37414.vda@port.imtp.ilyichevsk.odessa.ua> <20050318192808.GB38053@muc.de> X-Mailer: VM 7.19 under Emacs 21.4.1 Reply-To: davidm@hpl.hp.com X-URL: http://www.hpl.hp.com/personal/David_Mosberger/ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 996 Lines: 24 >>>>> On Fri, 18 Mar 2005 20:28:08 +0100, Andi Kleen said: >> stores in general for clearing pages? I checked and Itanium has >> always used non-temporal stores. So there will be no benefit for >> us from this Andi> That is weird. I would actually try to switch to temporal Andi> stores, maybe it will improve some benchmarks. That's definitely the case. See my earlier post on this topic: http://www.gelato.unsw.edu.au/linux-ia64/0409/11012.html Unfortunately, nobody reported any results for larger machines and/or more interesting workloads, so the patch is in limbo at this time. Clearly, if the CPU that's clearing the page is likely to use that same page soon after, it'd be useful to use temporal stores. --david - 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/