From owner-freebsd-questions@FreeBSD.ORG Thu Jan 11 01:38:19 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 5BA1A16A417 for ; Thu, 11 Jan 2007 01:38:19 +0000 (UTC) (envelope-from dghatikachalam@gmail.com) Received: from wx-out-0506.google.com (wx-out-0506.google.com [66.249.82.237]) by mx1.freebsd.org (Postfix) with ESMTP id 19E9F13C467 for ; Thu, 11 Jan 2007 01:38:19 +0000 (UTC) (envelope-from dghatikachalam@gmail.com) Received: by wx-out-0506.google.com with SMTP id s18so288620wxc for ; Wed, 10 Jan 2007 17:38:18 -0800 (PST) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=ojv9brmPKbRuO5Wqe9GVgC2ZjHh+Um0cPz0rBFiHxrbQw21S93z+bBc710MIFypNN7VR00W5X+zl706IJOKrmY0hKvtpJyCNkLQHHY9lkSh50822H++qze0speIABLpT3shd18eYwbODn6X6bsiFO+AeBinTQdA6rX6E0bJTxl4= Received: by 10.70.92.12 with SMTP id p12mr1835064wxb.1168479498622; Wed, 10 Jan 2007 17:38:18 -0800 (PST) Received: by 10.70.52.12 with HTTP; Wed, 10 Jan 2007 17:38:18 -0800 (PST) Message-ID: Date: Wed, 10 Jan 2007 20:38:18 -0500 From: "Dak Ghatikachalam" To: "Jay Chandler" , "Jeff MacDonald" , "FreeBSD Questions" In-Reply-To: <20070110235022.GA54481@owl.midgard.homeip.net> MIME-Version: 1.0 References: <45A56BF3.40209@chapman.edu> <20070110235022.GA54481@owl.midgard.homeip.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Subject: Re: Dell PE 1950 - Only seeing 3.2 gigs of ram X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 11 Jan 2007 01:38:19 -0000 if you calculate the 32bit addressing capability 2^32 -1 = 4294967296 - 1 = 4GB -1 you could counter I/O space, IRQ space for all the devices attached. I have heard something like parity interleave(I may be misspelling that word, but sounds close), you can knock off some more memory for this, and something like memory hole, you should knock off some more memory for this., sometimes video card also steal memory for acceleration, how much of it all depends. regards Dak On 1/10/07, Erik Trulsson wrote: > > On Wed, Jan 10, 2007 at 02:42:59PM -0800, Jay Chandler wrote: > > Jeff MacDonald wrote: > > >Hi, > > > > > >I put a fresh install of 6.1-RELEASE on a dell poweredge 1950 server. > > >It's configured with 4 gigs of ram. > > > > > >However when I boot i get the following right before DMESG > > > > > >786432k above 4GB ignored > > > > > >Which is strange, but then dmesg shows this > > > > > >real memory = 3489300480 (3327 MB) > > >avail memory = 3414659072 (3256 MB) > > > > > >Soo I'm at a bit of a loss. > > > > > >Jeff. > > > > > Same platform, same error. Anyone else have a clue for me? > > > > Part of the 32-bit address space is reserved for various > I/O-devices. This means that a 32-bit OS will not be > able to use all 4 GB of RAM but only a smaller amount (usually > around 3.5 GB.) > > If you were to use a 64-bit OS it would probably be able to access > all of the RAM if some of it is remapped to above the 4 GB > line. (There is usually an option in the BIOS to do this remapping.) > > > (This information is provided by most motherboard manufacturers > and many computer manufacturers (including Dell) in some FAQ. ) > > > > -- > > Erik Trulsson > ertr1013@student.uu.se > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" >