Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751771AbVJ1V2E (ORCPT ); Fri, 28 Oct 2005 17:28:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751817AbVJ1V2E (ORCPT ); Fri, 28 Oct 2005 17:28:04 -0400 Received: from smtp05.wanadoo.nl ([194.134.35.145]:33587 "EHLO smtp05.wanadoo.nl") by vger.kernel.org with ESMTP id S1751771AbVJ1V2D (ORCPT ); Fri, 28 Oct 2005 17:28:03 -0400 Message-ID: <436297DF.9070505@lazarenko.net> Date: Fri, 28 Oct 2005 23:27:59 +0200 From: Vladimir Lazarenko User-Agent: Mozilla Thunderbird 1.0.7 (Windows/20050923) X-Accept-Language: en-us, en MIME-Version: 1.0 To: thockin@hockin.org Cc: "Eric W. Biederman" , linux-kernel@vger.kernel.org Subject: Re: AMD Athlon64 X2 Dual-core and 4GB References: <4361408B.60903@lazarenko.net> <20051028160403.GA26286@hockin.org> <20051028171211.GA29861@hockin.org> In-Reply-To: <20051028171211.GA29861@hockin.org> Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="------------ms060901050006070405060104" X-Spam-Score: 0.1 (/) X-Spam-Report: Spam detection software, running on the system "dinosaur.lazarenko.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: >>>If you want to use 4GB in 32 bit mode, you *need* remapping (or you lose >>>part of your memory). Remapping means you have MORE than 4 GB of physical >>>address, which means you need PAE to use it at all. >> >>Yes, and PAE works fine with a 32bit kernel. I agree it is a silly >>configuration and a 64bit kernel would use the memory more >>efficiently. My basic point was that a dual-core is a recent enough >>processor from AMD that it supports memory remapping. So with a >>correct BIOS there should be no problems. > > > Earlier Opterons had remapping, too, just at the chip-select level. Even > with remapping, the memory that gets remapped gets mapped above 4 GB, so a > 32 bit kernel still needs PAE to address it. [...] Content analysis details: (0.1 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.1 AWL AWL: From: address is in the auto white-list Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6441 Lines: 111 This is a cryptographically signed message in MIME format. --------------ms060901050006070405060104 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit >>>If you want to use 4GB in 32 bit mode, you *need* remapping (or you lose >>>part of your memory). Remapping means you have MORE than 4 GB of physical >>>address, which means you need PAE to use it at all. >> >>Yes, and PAE works fine with a 32bit kernel. I agree it is a silly >>configuration and a 64bit kernel would use the memory more >>efficiently. My basic point was that a dual-core is a recent enough >>processor from AMD that it supports memory remapping. So with a >>correct BIOS there should be no problems. > > > Earlier Opterons had remapping, too, just at the chip-select level. Even > with remapping, the memory that gets remapped gets mapped above 4 GB, so a > 32 bit kernel still needs PAE to address it. Well, my BIOS had 2 types of re-mapping, H/W and S/W, i enabled H/W remapping, compiled kernel with 64G HIGHMEM, and voila: vlad@anarxi:~$ free total used free shared buffers cached Mem: 4151876 2972968 1178908 0 179008 679016 -/+ buffers/cache: 2114944 2036932 Thanks everyone! 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