From owner-freebsd-stable@freebsd.org Sun Jan 28 16:05:57 2018 Return-Path: Delivered-To: freebsd-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 422E1ECF7D7 for ; Sun, 28 Jan 2018 16:05:57 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from tensor.andric.com (tensor.andric.com [87.251.56.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "tensor.andric.com", Issuer "COMODO RSA Domain Validation Secure Server CA" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id D8B47839D8 for ; Sun, 28 Jan 2018 16:05:56 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from coleburn.home.andric.com (coleburn.home.andric.com [192.168.0.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by tensor.andric.com (Postfix) with ESMTPSA id 40C61EFEA; Sun, 28 Jan 2018 17:05:55 +0100 (CET) From: Dimitry Andric Message-Id: Content-Type: multipart/signed; boundary="Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD"; protocol="application/pgp-signature"; micalg=pgp-sha1 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: i386 with 4GB RAM: less than 2GB available on A2SAV (Intel Atom E3940) Date: Sun, 28 Jan 2018 17:05:54 +0100 In-Reply-To: <20180128145703.GA80724@bali> Cc: freebsd-stable@freebsd.org To: Andre Albsmeier References: <20180128145703.GA80724@bali> X-Mailer: Apple Mail (2.3273) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 28 Jan 2018 16:05:57 -0000 --Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii On 28 Jan 2018, at 15:57, Andre Albsmeier = wrote: > I have a lot of machines running with 4 GB physical RAM and, for > some reasons, I still have to use a 32 bits OS. >=20 > All of them show something between 3 and 3.5 GB of RAM available > in dmesg but the brand new Supermicro A2SAV really shocked me: >=20 > FreeBSD 11.1-STABLE #0: Mon Jan 15 06:57:10 CET 2018 > ... > real memory =3D 4294967296 (4096 MB) > avail memory =3D 1939558400 (1849 MB) > ... >=20 > So do people have any ideas how I might get a bit closer to at least > 3 GB? I assume there are no FreeBSD knobs which might help but hope > dies last... This is a common problem on i386. Most likely some ranges are reserved for I/O mappings, such as video cards. If you boot with -v, I think the kernel prints an overview of the physical ram chunks available? I don't know of any other way to get such an overview. Another option is to try PAE, but I have no idea how stable that is... -Dimitry --Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCWm304gAKCRCwXqMKLiCW o7yMAKDVrmxIEzH+TqDgiVERycLOorYS8QCg/3Rq0YoZ7cKbrTdBbsLGGB6O1P8= =DpaO -----END PGP SIGNATURE----- --Apple-Mail=_F0028242-B705-458D-93D7-A2930ED772FD--