From owner-freebsd-fs@FreeBSD.ORG  Fri Aug 17 22:51:05 2007
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 2905016A419
	for <freebsd-fs@freebsd.org>; Fri, 17 Aug 2007 22:51:05 +0000 (UTC)
	(envelope-from rick@kiwi-computer.com)
Received: from kiwi-computer.com (keira.kiwi-computer.com [63.224.10.3])
	by mx1.freebsd.org (Postfix) with SMTP id A89EE13C46E
	for <freebsd-fs@freebsd.org>; Fri, 17 Aug 2007 22:51:04 +0000 (UTC)
	(envelope-from rick@kiwi-computer.com)
Received: (qmail 92677 invoked by uid 2001); 17 Aug 2007 22:51:03 -0000
Date: Fri, 17 Aug 2007 17:51:03 -0500
From: "Rick C. Petty" <rick-freebsd@kiwi-computer.com>
To: Dag-Erling Sm??rgrav <des@des.no>
Message-ID: <20070817225103.GA92437@keira.kiwi-computer.com>
References: <723681.52797.qm@web63012.mail.re1.yahoo.com>
	<20070817020201.GA41414@keira.kiwi-computer.com>
	<867inuibu4.fsf@ds4.des.no>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <867inuibu4.fsf@ds4.des.no>
User-Agent: Mutt/1.4.2.1i
Cc: freebsd-fs@freebsd.org, Gore Jarold <gore_jarold@yahoo.com>
Subject: Re: vfs.ufs.dirhash_maxmem ... how high can I go ?
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: rick-freebsd@kiwi-computer.com
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 17 Aug 2007 22:51:05 -0000

On Fri, Aug 17, 2007 at 02:29:07PM +0200, Dag-Erling Sm??rgrav wrote:
> "Rick C. Petty" <rick-freebsd@kiwi-computer.com> writes:
> > Gore Jarold <gore_jarold@yahoo.com> writes:
> > > I have 4 GB of physical and 4 GB of swap, running on normal 32-bit
> > > x86, and I have this set as well:
> > Which means (on an x86 system) that you have 3 GB of physical RAM.
> 
> No, it means has 4 GB of physical RAM, of which 3.5 GB are addressable.

I've never seen FreeBSD address more than 3.0 GB of RAM without PAE..  it
always seems to reserve 1.0 GB for video & other mmap'd I/O.

I've tried this in systems with 4 MB video cards and most devices disabled.
I thought you had to tweak some sysctl in freebsd to force the kernel not
to map that last 1 GB.

-- Rick C. Petty