From owner-freebsd-stable@FreeBSD.ORG Sun Apr 22 09:33:01 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 0F22716A402 for ; Sun, 22 Apr 2007 09:33:01 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from ch-smtp02.sth.basefarm.net (ch-smtp02.sth.basefarm.net [80.76.149.213]) by mx1.freebsd.org (Postfix) with ESMTP id BEEC013C44B for ; Sun, 22 Apr 2007 09:33:00 +0000 (UTC) (envelope-from erikt@midgard.homeip.net) Received: from c83-253-10-135.bredband.comhem.se ([83.253.10.135]:50974 helo=falcon.midgard.homeip.net) by ch-smtp02.sth.basefarm.net with smtp (Exim 4.63) (envelope-from ) id 1HfYRH-00016R-8F for freebsd-stable@freebsd.org; Sun, 22 Apr 2007 11:32:59 +0200 Received: (qmail 6878 invoked from network); 22 Apr 2007 11:32:56 +0200 Received: from owl.midgard.homeip.net (10.1.5.7) by falcon.midgard.homeip.net with SMTP; 22 Apr 2007 11:32:56 +0200 Received: (qmail 43958 invoked by uid 1001); 22 Apr 2007 11:32:56 +0200 Date: Sun, 22 Apr 2007 11:32:56 +0200 From: Erik Trulsson To: Artem Kuchin Message-ID: <20070422093256.GA43926@owl.midgard.homeip.net> Mail-Followup-To: Artem Kuchin , Scott Long , freebsd-stable@freebsd.org References: <462A78F5.3090904@samsco.org> <001e01c784be$9b969c20$0c00a8c0@Artem> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <001e01c784be$9b969c20$0c00a8c0@Artem> User-Agent: Mutt/1.5.14 (2007-02-12) X-ACL-Warn: Too high rate of unknown addresses received from you X-Scan-Result: No virus found in message 1HfYRH-00016R-8F. X-Scan-Signature: ch-smtp02.sth.basefarm.net 1HfYRH-00016R-8F 5110f4fa0977f98eea498470a80b815a Cc: freebsd-stable@freebsd.org Subject: Re: PAE does not give any ram increase, why? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 22 Apr 2007 09:33:01 -0000 On Sun, Apr 22, 2007 at 01:14:17PM +0400, Artem Kuchin wrote: > > >>the number do not change with or without PAE > >> > >>Maybe i look in the wrong place? > >> > > > >I'm not going to waste my time explaining for the hundredth time how > >the x86 memory layout works. If you want to recover the missing > >256MB, go look in your BIOS for an option about memory hole remapping. > > No need, i know this stuff. Problem is that asus p5p800-vm bios does not > have such option (no memory remapping support in chipset) > , so, and simply assumed that in PAE mode this simply > does not matter and it will give me whole 4GB. Isn't it so? > Is it true for 64bit mode (amd64)? It is not so for either of PAE or 64-bit mode. What those give you is the ability to address memory above the 4GB limit. In order to access memory below the 4GB boundary that is shadowed by various I/O-devices, the RAM will have to be remapped to somewehere else. So if you could remap the memory then PAE or 64-bit mode would give you the ability to access it. If you can't remap it you can't get hold of it. -- Erik Trulsson ertr1013@student.uu.se