Date: Thu, 27 Mar 2008 15:35:32 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD-6.3 only detects 3GB of RAM Message-ID: <fsgbbk$gdj$1@ger.gmane.org> In-Reply-To: <20080327142605.6190DC33C@cork.irdesign.cypress.com> References: <003501c89014$77ddf640$6799e2c0$@com> <20080327142605.6190DC33C@cork.irdesign.cypress.com>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enigC1A87195F072242B18E28555 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable lhecking@users.sourceforge.net wrote: > fred writes: >> Hello all, >> >> I am trying to fix an issue with my dual xeon ibm server, it only dete= cts >> 3GB or RAM but I have 4GB: > [...] >=20 > I have seen this problem under Linux on IBM Intellistations (6225). > IBM pointed me to a tech document (the number of which I do not > remember) that says when the machine detects more than 3GB, it uses > some of that memory internally for ... stuff. Still, I find stealing > 1GB quite unacceptable. This question is answered almost once a week. Search the archives and you will find plenty of explanations, both long and short. Short version: you cannot use memory near 4 GB on 32-bit operating systems (it's a hardware limitation). You can either compile a kernel with PAE (http://en.wikipedia.org/wiki/Physical_Address_Extension) or a 64-bit version of the operating system (in FreeBSD it's called AMD64 since AMD was first to create the hardware, http://en.wikipedia.org/wiki/AMD64). --------------enigC1A87195F072242B18E28555 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFH67C0ldnAQVacBcgRArRhAJ4yhaHMOMy+vUXu7qa/DHEPm97WUQCeLxic 4n5dDcee2cUikSPkIZJoDOw= =wIFE -----END PGP SIGNATURE----- --------------enigC1A87195F072242B18E28555--
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