From owner-freebsd-bugs@FreeBSD.ORG Sat Jul 5 12:51:26 2008 Return-Path: Delivered-To: freebsd-bugs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 0B0DB1065673 for ; Sat, 5 Jul 2008 12:51:26 +0000 (UTC) (envelope-from spawk@acm.poly.edu) Received: from acm.poly.edu (acm.poly.edu [128.238.9.200]) by mx1.freebsd.org (Postfix) with ESMTP id 9F7788FC21 for ; Sat, 5 Jul 2008 12:51:25 +0000 (UTC) (envelope-from spawk@acm.poly.edu) Received: (qmail 37136 invoked from network); 5 Jul 2008 12:24:43 -0000 Received: from unknown (HELO ?192.168.0.2?) (spawk@69.123.45.64) by acm.poly.edu with AES256-SHA encrypted SMTP; 5 Jul 2008 12:24:43 -0000 Message-ID: <486F67FD.9000200@acm.poly.edu> Date: Sat, 05 Jul 2008 08:24:29 -0400 From: Boris Kochergin User-Agent: Thunderbird 2.0.0.9 (X11/20071208) MIME-Version: 1.0 To: Robert Heron References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-bugs@freebsd.org Subject: Re: FreeBSD 7.0 and RAM limit X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 05 Jul 2008 12:51:26 -0000 Robert Heron wrote: > Hi, > > I use: > > FreeBSD 7.0-R on i386 server with motherboard S5000VSA and 6GB RAM > onboard. BIOS version - 88 (the latest) > > Kernel includes: options MAXMEM=(6*1024*1024) > > And FreeBSD reports only: > > real memory = 2680160256 (2556 MB) > avail memory = 2617892864 (2496 MB) > > Why? What is wrong that FreeBSD sees only about 2.5GB instead of 6GB? > > Robert > > _______________________________________________ > freebsd-bugs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-bugs > To unsubscribe, send any mail to "freebsd-bugs-unsubscribe@freebsd.org" You probably have to compile your kernel with the PAE(4) option, as the i386 architecture only supports up to 4 GiB without physical address extentions, and some of it (512 MiB, I believe) is made unavailable to the operating system because that address space is reserved for PCI. -Boris