From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932899AbXHYJYt (ORCPT ); Sat, 25 Aug 2007 05:24:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753896AbXHYJYk (ORCPT ); Sat, 25 Aug 2007 05:24:40 -0400 Received: from ns.suse.de ([195.135.220.2]:37965 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753580AbXHYJYj (ORCPT ); Sat, 25 Aug 2007 05:24:39 -0400 Date: Sat, 25 Aug 2007 11:24:35 +0200 From: Andi Kleen To: "Siddha, Suresh B" Cc: travis@sgi.com, Andi Kleen , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrew Morton , Christoph Lameter Subject: Re: [PATCH 0/6] x86: Reduce Memory Usage and Inter-Node message traffic (v2) Message-ID: <20070825092434.GE16227@bingen.suse.de> References: <20070824222654.687510000@sgi.com> <20070825005017.GC1894@linux-os.sc.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070825005017.GC1894@linux-os.sc.intel.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 24, 2007 at 05:50:18PM -0700, Siddha, Suresh B wrote: > On Fri, Aug 24, 2007 at 03:26:54PM -0700, travis@sgi.com wrote: > > Previous Intro: > > Thanks for doing this. > > > In x86_64 and i386 architectures most arrays that are sized > > using NR_CPUS lay in local memory on node 0. Not only will most > > (99%?) of the systems not use all the slots in these arrays, > > particularly when NR_CPUS is increased to accommodate future > > very high cpu count systems, but a number of cache lines are > > passed unnecessarily on the system bus when these arrays are > > referenced by cpus on other nodes. > > Can we move cpuinfo_x86 also to per cpu area? Though critical run I worry how much impact that would be? boot_cpu_data is quite widely used. > Wonder if this confusion is the reason for git commit f3fa8ebc What git commit (full id) ? -Andi