Date: Wed, 3 Aug 2005 09:17:49 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: "O. Hartmann" <ohartman@mail.uni-mainz.de> Cc: Indigo 23 <indigo23@gmail.com>, freebsd-smp@freebsd.org, Arthur Hartwig <ahartwig@iprg.nokia.com> Subject: Re: Experiences with Intel 820 Dual-Core.... Message-ID: <20050803161749.GA3670@odin.ac.hmc.edu> In-Reply-To: <42F07579.3050302@mail.uni-mainz.de> References: <6f50eac40508011839735ce37e@mail.gmail.com> <42F00621.9040705@iprg.nokia.com> <42F07579.3050302@mail.uni-mainz.de>
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--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--
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