From owner-freebsd-smp@FreeBSD.ORG Wed Aug 3 16:17:50 2005 Return-Path: X-Original-To: freebsd-smp@freebsd.org Delivered-To: freebsd-smp@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 67C5616A41F for ; Wed, 3 Aug 2005 16:17:50 +0000 (GMT) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (Odin.AC.HMC.Edu [134.173.32.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 125EA43D45 for ; Wed, 3 Aug 2005 16:17:49 +0000 (GMT) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (localhost.localdomain [127.0.0.1]) by odin.ac.hmc.edu (8.13.0/8.13.0) with ESMTP id j73GHnOO004230; Wed, 3 Aug 2005 09:17:49 -0700 Received: (from brdavis@localhost) by odin.ac.hmc.edu (8.13.0/8.13.0/Submit) id j73GHnTE004223; Wed, 3 Aug 2005 09:17:49 -0700 Date: Wed, 3 Aug 2005 09:17:49 -0700 From: Brooks Davis To: "O. Hartmann" Message-ID: <20050803161749.GA3670@odin.ac.hmc.edu> References: <6f50eac40508011839735ce37e@mail.gmail.com> <42F00621.9040705@iprg.nokia.com> <42F07579.3050302@mail.uni-mainz.de> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="3MwIy2ne0vdjdPXF" Content-Disposition: inline In-Reply-To: <42F07579.3050302@mail.uni-mainz.de> User-Agent: Mutt/1.4.1i X-Virus-Scanned: by amavisd-new X-Spam-Status: No, hits=0.0 required=8.0 tests=none autolearn=no version=2.63 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on odin.ac.hmc.edu Cc: Indigo 23 , freebsd-smp@freebsd.org, Arthur Hartwig Subject: Re: Experiences with Intel 820 Dual-Core.... X-BeenThere: freebsd-smp@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: FreeBSD SMP implementation group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Aug 2005 16:17:50 -0000 --3MwIy2ne0vdjdPXF Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Aug 03, 2005 at 09:42:49AM +0200, O. Hartmann wrote: > Arthur Hartwig schrieb: >=20 > >I have a Gigabyte 8I945P-G motherboard with a Pentium D 820 CPU. =20 > >Hyperthreading needs to be enabled in the BIOS for FreeBSD to see the=20 > >second CPU. It appears the CPU presents itself as a hyperthreaded CPU=20 > >with two "logical" CPUs - each "logical" CPU actually corresponding to= =20 > >a CPU core. > > > I think this is done due to licencing restrictions of several operating= =20 > systems (which have CPU-bound licencing models). Showing a second CPU on= =20 > a dual-core die as a hyper-threaded seems to avoid this problem. The=20 > question is now: AMD does not have HT, do they also show the second CPU= =20 > as a logical one (from the point of view of the BIOS)? Yes, but with a second flag that says it's a full core. I presume intel did something similar. -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --3MwIy2ne0vdjdPXF Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFC8O4sXY6L6fI4GtQRAuLFAKC42HZuHtEQl6I4FlntVzUP+qvfYQCdFVVi 0YzM6YuFhkENFqWT93P3QdU= =pDUq -----END PGP SIGNATURE----- --3MwIy2ne0vdjdPXF--