From owner-freebsd-questions@FreeBSD.ORG Mon Dec 22 20:31:55 2008 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 9EB0C1065678 for ; Mon, 22 Dec 2008 20:31:55 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by mx1.freebsd.org (Postfix) with ESMTP id 7068C8FC17 for ; Mon, 22 Dec 2008 20:31:53 +0000 (UTC) (envelope-from freebsd-questions@m.gmane.org) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1LErRM-00012F-Jz for freebsd-questions@freebsd.org; Mon, 22 Dec 2008 20:31:48 +0000 Received: from 93-138-92-40.adsl.net.t-com.hr ([93.138.92.40]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 22 Dec 2008 20:31:48 +0000 Received: from ivoras by 93-138-92-40.adsl.net.t-com.hr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 22 Dec 2008 20:31:48 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: freebsd-questions@freebsd.org From: Ivan Voras Date: Mon, 22 Dec 2008 21:31:39 +0100 Lines: 41 Message-ID: References: <200812202039.NAA10290@lariat.net> <20081222092818.N17220@wojtek.tensor.gdynia.pl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig5A1ABF547A065D94ACDEC6BF" X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 93-138-92-40.adsl.net.t-com.hr User-Agent: Thunderbird 2.0.0.18 (Windows/20081105) In-Reply-To: <20081222092818.N17220@wojtek.tensor.gdynia.pl> X-Enigmail-Version: 0.95.7 Sender: news Subject: Re: Status of hyperthreading in FreeBSD X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Dec 2008 20:31:55 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig5A1ABF547A065D94ACDEC6BF Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Wojciech Puchar wrote: >> >> Atom's HTT is actually pretty good - I saw up to 25% more performance >> simply by using multithreading in 7zip's compression benchmark (on >> WinXP, though). Of course, OTOH it uses about that much more transisto= rs >> on the CPU die so it's not exactly free performance. >=20 > really that much? i thought maybe 1-2% (just 2 sets of registers). Screenshots are available :) I was also surprised because in this case both threads use the same algorithm with the same requirements on registers. It used to be (in the days of Pentium 4) that HTT would work best if the two threads used different sets of instructions and registers (e.g. one doing integer math and another doing floating point math). I guess they made more effort this time. --------------enig5A1ABF547A065D94ACDEC6BF Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAklP+SsACgkQldnAQVacBciP+ACgsJs0OpCk7R6ce5SUbNQcbMRy 1+EAnixv9YXJF4sd4ta1RirfKNOAanss =2YNh -----END PGP SIGNATURE----- --------------enig5A1ABF547A065D94ACDEC6BF--