Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932687AbXKOWNW (ORCPT ); Thu, 15 Nov 2007 17:13:22 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753480AbXKOWNI (ORCPT ); Thu, 15 Nov 2007 17:13:08 -0500 Received: from smtp2.linux-foundation.org ([207.189.120.14]:51208 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753041AbXKOWNF (ORCPT ); Thu, 15 Nov 2007 17:13:05 -0500 Date: Thu, 15 Nov 2007 14:12:12 -0800 From: Andrew Morton To: Christoph Lameter Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, mel@csn.ul.ie, ak@suse.de, apw@shadowen.org Subject: Re: x86_64: Make sparsemem/vmemmap the default memory model Message-Id: <20071115141212.acb215f1.akpm@linux-foundation.org> In-Reply-To: References: <200711130059.34346.ak@suse.de> <200711130149.54852.ak@suse.de> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.20; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 859 Lines: 20 On Mon, 12 Nov 2007 19:42:31 -0800 (PST) Christoph Lameter wrote: > x86_64: Make sparsemem/vmemmap the default memory model > > Use sparsemem as the only memory model for UP, SMP and NUMA. > Measurements indicate that DISCONTIGMEM has a higher overhead > than sparsemem. And FLATMEMs benefits are minimal. So I think its > best to simply standardize on sparsemem. Unfortunately some loon has gone and merged the i386 and x86_64 Kconfig files. I was fixing that up but I worry what effects these Kconfig changes might have on, for example, i386 NUMA setups. So I'll duck this version, sorry. - 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/