Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751019AbWAJSl3 (ORCPT ); Tue, 10 Jan 2006 13:41:29 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751090AbWAJSl3 (ORCPT ); Tue, 10 Jan 2006 13:41:29 -0500 Received: from master.soleranetworks.com ([67.137.28.188]:24215 "EHLO master.soleranetworks.com") by vger.kernel.org with ESMTP id S1751019AbWAJSl2 (ORCPT ); Tue, 10 Jan 2006 13:41:28 -0500 Message-ID: <43C3E74D.7060309@wolfmountaingroup.com> Date: Tue, 10 Jan 2006 09:56:45 -0700 From: "Jeff V. Merkey" User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.6) Gecko/20040510 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Linus Torvalds Cc: Martin Bligh , Jens Axboe , Byron Stanoszek , Ingo Molnar , linux-kernel@vger.kernel.org, Andrew Morton Subject: Re: 2G memory split References: <20060110125852.GA3389@suse.de> <20060110132957.GA28666@elte.hu> <20060110133728.GB3389@suse.de> <20060110143931.GM3389@suse.de> <43C3F986.4090209@mbligh.org> In-Reply-To: Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1340 Lines: 48 Linus Torvalds wrote: >On Tue, 10 Jan 2006, Martin Bligh wrote: > > >>The non-1GB-aligned ones need to be disbarred when PAE is on, I think. >> >> > >Well, right now _all_ the non-3:1 cases need to be disbarred. I think we >depend on the kernel mapping only ever being the _one_ last entry in the >top-level page table, which is only true with the 3:1 mapping. > >But I didn't check. > > No. It works fine (or seems to) with 2:2 mapping. I've tested with these extensively and am shipping products on the 1U appliances with 2:2 and I have never seen any problems with 2.6.9-2.6.13. The only unpleasant side affect with 3:1 is user apps seem to rely on swap space a little more than I like -- perhaps this is the side affect you are referring to? RH ES uses 4:4 which is ideal and superior to this hack. Jeff > Linus >- >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/ > > > - 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/