From owner-freebsd-questions@FreeBSD.ORG  Fri Sep 30 17:14:03 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 89C7D16A41F
	for <freebsd-questions@freebsd.org>;
	Fri, 30 Sep 2005 17:14:03 +0000 (GMT)
	(envelope-from dpkirchner@gmail.com)
Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.196])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 22CF843D48
	for <freebsd-questions@freebsd.org>;
	Fri, 30 Sep 2005 17:14:03 +0000 (GMT)
	(envelope-from dpkirchner@gmail.com)
Received: by xproxy.gmail.com with SMTP id t13so1735901wxc
	for <freebsd-questions@freebsd.org>;
	Fri, 30 Sep 2005 10:14:02 -0700 (PDT)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:reply-to:sender:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=HncSP9yDCSi2lRJuZnlJ6l3EpXjSsQ+2lVZHbhBwAgVfjoJtXql/IlJii7aMCRqhO5ieYyczMt+ScZzPDHh+/M1aGyVDi/laMob4J5/y/QgX+9a+vXis9lYsaWHeYBgopmHmB++MwTBuXJlZE9QTnbxcTwRTPIXgPYISnqH7aGc=
Received: by 10.70.109.7 with SMTP id h7mr975955wxc;
	Fri, 30 Sep 2005 10:14:02 -0700 (PDT)
Received: by 10.70.104.20 with HTTP; Fri, 30 Sep 2005 10:14:02 -0700 (PDT)
Message-ID: <35c231bf0509301014k3d54fa24u4effc3273e0a1262@mail.gmail.com>
Date: Fri, 30 Sep 2005 10:14:02 -0700
From: David Kirchner <dpk@dpk.net>
Sender: dpkirchner@gmail.com
To: "Tamouh H." <hakmi@rogers.com>
In-Reply-To: <20050930153855.204C943D49@mx1.FreeBSD.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
Content-Disposition: inline
References: <20050930153855.204C943D49@mx1.FreeBSD.org>
Cc: freebsd-questions@freebsd.org
Subject: Re: Weird Real memory reported with 5.4 PAE support
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: David Kirchner <dpk@dpk.net>
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 30 Sep 2005 17:14:03 -0000

On 9/30/05, Tamouh H. <hakmi@rogers.com> wrote:
>
> Hello,
>
> We have a Supermicro that has Winston 4GB of ECC Registered DDR333 RAM. D=
ual
> Xeon Processors.
>
> With PAE enabled, it seems the system reports 6GB of realmemory instead o=
f
> 4GB, as below:

We've seen similar stuff with Supermicro servers. PCI/PCI-X/PCI-E (or
something like that) uses memory addresses in the upper end of the 4GB
barrier. The BIOS remaps any real memory above that. The more PCI
slots you have the more is reserved, and the higher the BIOS has to
remap it. (Someone can correct me if I'm wrong here, I may be
oversimplifying).

The panics you are seeing are a known bug in FreeBSD 5.4-RELEASE. The
bug is fixed in 5-STABLE:

http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/pmap.c.diff?r1=3D1.=
494.2.9&r2=3D1.494.2.10&f=3Dh

For an unknown reason, the patch has not been commited to the
5.4-RELEASE-p* branches, or 5.4-STABLE. If you don't want to move all
the way to 5-STABLE you can just make the above changes manually (it's
just 2 lines) and rebuild, and it'll work fine.