From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 24 Jan 2002 14:21:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 24 Jan 2002 14:21:27 -0500 Received: from [24.64.71.161] ([24.64.71.161]:2036 "EHLO lynx.adilger.int") by vger.kernel.org with ESMTP id ; Thu, 24 Jan 2002 14:21:17 -0500 Date: Thu, 24 Jan 2002 12:19:52 -0700 From: Andreas Dilger To: William Lee Irwin III , Denis Vlasenko , "Martin J. Bligh" , Barry Wu , linux-kernel@vger.kernel.org Subject: Re: Can linux support ccNUMA machine now? Message-ID: <20020124121952.A763@lynx.adilger.int> Mail-Followup-To: William Lee Irwin III , Denis Vlasenko , "Martin J. Bligh" , Barry Wu , linux-kernel@vger.kernel.org In-Reply-To: <20020123003530.60778.qmail@web13903.mail.yahoo.com> <74750000.1011782724@flay> <20020123200405.D899@holomorphy.com> <200201241215.g0OCFSE10537@Port.imtp.ilyichevsk.odessa.ua> <20020124105008.E872@holomorphy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: <20020124105008.E872@holomorphy.com>; from wli@holomorphy.com on Thu, Jan 24, 2002 at 10:50:08AM -0800 X-GPG-Key: 1024D/0D35BED6 X-GPG-Fingerprint: 7A37 5D79 BF1B CECA D44F 8A29 A488 39F5 0D35 BED6 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Jan 24, 2002 10:50 -0800, William Lee Irwin III wrote: > On Thu, Jan 24, 2002 at 02:15:30PM -0200, Denis Vlasenko wrote: > > Looks like running x86 with more than 16GB RAM is not a good idea. > > If you need it, you need 64bit arch. Actually, Andrea made a patch to move the page tables into HIMEM on such machines. I believe it is in the latest -aa patch. > Reducing overhead helps all boxen everywhere all the time. Turning the > kernel upside-down for the corner case of 64GB isn't worth it, but > finding more graceful ways to fail than not booting with no visible > error messages, and perhaps extending the range of configurations where > the kernel actually functions (within reason) by reducing space > overhead is worthwhile. Yes, there also have been several patches floating around to reduce the size of struct page. I don't think any are in the kernel yet. Cheers, Andreas -- Andreas Dilger http://sourceforge.net/projects/ext2resize/ http://www-mddsp.enel.ucalgary.ca/People/adilger/