From owner-freebsd-questions@FreeBSD.ORG Tue Nov 9 13:17:19 2010 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 1EC52106566B for ; Tue, 9 Nov 2010 13:17:19 +0000 (UTC) (envelope-from svein-listmail@stillbilde.net) Received: from mail.stillbilde.net (d80.iso100.no [81.175.61.195]) by mx1.freebsd.org (Postfix) with ESMTP id CA0608FC1B for ; Tue, 9 Nov 2010 13:17:18 +0000 (UTC) Received: from [127.0.0.1] (unknown [192.168.12.4]) (Authenticated sender: svein-listmail) by mail.stillbilde.net (Familien Skogens mail) with ESMTPSA id 63ABC22 for ; Tue, 9 Nov 2010 14:17:18 +0100 (CET) Message-ID: <4CD949D7.6030003@stillbilde.net> Date: Tue, 09 Nov 2010 14:17:11 +0100 From: "Svein Skogen (Listmail account)" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12) Gecko/20101027 Lightning/1.0b2 Thunderbird/3.1.6 MIME-Version: 1.0 To: freebsd-questions@freebsd.org References: <201011091256.51140.naylor.b.david@gmail.com> In-Reply-To: <201011091256.51140.naylor.b.david@gmail.com> X-Enigmail-Version: 1.1.1 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="------------enig5CFB1A3B10D5E31420103943" Subject: Re: Per core frequency control 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: Tue, 09 Nov 2010 13:17:19 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig5CFB1A3B10D5E31420103943 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 09.11.2010 11:56, David Naylor wrote: > Hi, >=20 > I was reading through cpufreq(4) and in the bugs section it mentions th= at per=20 > core (or CPU) frequency control is not supported. That all cores/CPUs = have to=20 > be at the same speed. =20 >=20 > What is the reason for that? =20 >=20 > Is it an infrastructure problem with FreeBSD or has it just not been=20 > implemented? =20 >=20 > And how will the recent work on event timers (and a "tickless" kernel) = impact=20 > on this problem?=20 You did read the "symmetric" part of "symmetric multi processor" didn't y= ou? It's a limitation of the technology. One clock. //Svein --=20 --------+-------------------+------------------------------- /"\ |Svein Skogen | svein@d80.iso100.no \ / |Solberg =D8stli 9 | PGP Key: 0xE5E76831 X |2020 Skedsmokorset | svein@jernhuset.no / \ |Norway | PGP Key: 0xCE96CE13 | | svein@stillbilde.net ascii | | PGP Key: 0x58CD33B6 ribbon |System Admin | svein-listmail@stillbilde.net Campaign|stillbilde.net | PGP Key: 0x22D494A4 +-------------------+------------------------------- |msn messenger: | Mobile Phone: +47 907 03 575 |svein@jernhuset.no | RIPE handle: SS16503-RIPE --------+-------------------+------------------------------- A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing on usenet and in e-mail? ------------------------------------------------------------ Picture Gallery: https://gallery.stillbilde.net/v/svein/ ------------------------------------------------------------ --------------enig5CFB1A3B10D5E31420103943 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkzZSdsACgkQODUnwSLUlKQygQCfYysmjfV25f+xQ0hxUssaeUS2 jsMAnitqb75CHoo+b2XYDBS3XVx5354c =Tv7A -----END PGP SIGNATURE----- --------------enig5CFB1A3B10D5E31420103943--