From owner-freebsd-current@FreeBSD.ORG Tue Jun 22 22:05:08 2004 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 855F416A4CE for ; Tue, 22 Jun 2004 22:05:08 +0000 (GMT) Received: from mail3.speakeasy.net (mail3.speakeasy.net [216.254.0.203]) by mx1.FreeBSD.org (Postfix) with ESMTP id 616C543D31 for ; Tue, 22 Jun 2004 22:05:08 +0000 (GMT) (envelope-from jhb@FreeBSD.org) Received: (qmail 8174 invoked from network); 22 Jun 2004 22:04:47 -0000 Received: from dsl027-160-063.atl1.dsl.speakeasy.net (HELO server.baldwin.cx) ([216.27.160.63]) (envelope-sender ) encrypted SMTP for ; 22 Jun 2004 22:04:47 -0000 Received: from 10.50.41.233 (gw1.twc.weather.com [216.133.140.1]) by server.baldwin.cx (8.12.11/8.12.11) with ESMTP id i5MM4i8J020067; Tue, 22 Jun 2004 18:04:44 -0400 (EDT) (envelope-from jhb@FreeBSD.org) From: John Baldwin To: Matthew Dillon Date: Tue, 22 Jun 2004 18:05:44 -0400 User-Agent: KMail/1.6 References: <200406221708.32433.jhb@FreeBSD.org> <200406222134.i5MLYQ9O041828@apollo.backplane.com> In-Reply-To: <200406222134.i5MLYQ9O041828@apollo.backplane.com> MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Message-Id: <200406221805.44339.jhb@FreeBSD.org> X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on server.baldwin.cx cc: current@FreeBSD.org cc: Julian Elischer Subject: Re: STI, HLT in acpi_cpu_idle_c1 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Jun 2004 22:05:08 -0000 On Tuesday 22 June 2004 05:34 pm, Matthew Dillon wrote: > :On Thursday 17 June 2004 07:33 pm, Matthew Dillon wrote: > :> It kinda sounds like ACPI has bokered the other cpus. I'm not sure > :> why one would even *want* to use ACPI to idle down Xeon's in an MP > :> system, actually :-) > : > :Power and heat savings. > : > :-- > :John Baldwin <>< http://www.FreeBSD.org/~jhb/ > > All well and nice, but if you want power and heat savings you don't > purchase a big honking SMP box in the first place. > > This sounds like a disaster waiting to happen to me. ACPI barely works > on UP systems, there is no way I would ever trust it to properly HLT or > otherwise screw around with the cpu timing on an SMP system. HLT is > plenty good enough. IMHO this type of feature is not something that > should be turned on by default on SMP. Certain large CPU vendors disagree. http://www.theinquirer.net/?article=16739 -- John Baldwin <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org