From owner-freebsd-current@FreeBSD.ORG  Tue Nov  9 16:45:14 2010
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 41C7C10656A4
	for <current@freebsd.org>; Tue,  9 Nov 2010 16:45:14 +0000 (UTC)
	(envelope-from julian@freebsd.org)
Received: from out-0.mx.aerioconnect.net (outu.internet-mail-service.net
	[216.240.47.244])
	by mx1.freebsd.org (Postfix) with ESMTP id 0BAD08FC29
	for <current@freebsd.org>; Tue,  9 Nov 2010 16:45:13 +0000 (UTC)
Received: from idiom.com (postfix@mx0.idiom.com [216.240.32.160])
	by out-0.mx.aerioconnect.net (8.13.8/8.13.8) with ESMTP id
	oA9GjDni012180; Tue, 9 Nov 2010 08:45:13 -0800
X-Client-Authorized: MaGic Cook1e
X-Client-Authorized: MaGic Cook1e
Received: from julian-mac.elischer.org
	(h-67-100-89-137.snfccasy.static.covad.net [67.100.89.137])
	by idiom.com (Postfix) with ESMTP id 702822D6015;
	Tue,  9 Nov 2010 08:45:11 -0800 (PST)
Message-ID: <4CD97A9A.8000007@freebsd.org>
Date: Tue, 09 Nov 2010 08:45:14 -0800
From: Julian Elischer <julian@freebsd.org>
User-Agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US;
	rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6
MIME-Version: 1.0
To: FreeBSD Current <current@freebsd.org>, alc@freebsd.org
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Scanned-By: MIMEDefang 2.67 on 216.240.47.51
Cc: 
Subject: limits to memory on amd64
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 09 Nov 2010 16:45:14 -0000

During the discussion at MeetBSD the question came up as to what the real
limiting factors were with regard to how much RAM a system could have.
it was put to us that the limit was currently around 512 GB, though no-one
at teh discussion knew what the mechanism of the limitation was or 
what might ligh
beyond it.

Could anyone who knows, pipe upt and let use know what the factors 
are, and if the
current limit is overcome, what the next one after that will be?

Julian