From owner-freebsd-hackers@FreeBSD.ORG Fri Aug 10 11:15:23 2007 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id D2B9416A419 for ; Fri, 10 Aug 2007 11:15:23 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (tim.des.no [194.63.250.121]) by mx1.freebsd.org (Postfix) with ESMTP id 92C5413C45A for ; Fri, 10 Aug 2007 11:15:23 +0000 (UTC) (envelope-from des@des.no) Received: from tim.des.no (localhost [127.0.0.1]) by spam.des.no (Postfix) with ESMTP id 1E31320B4; Fri, 10 Aug 2007 13:15:20 +0200 (CEST) X-Spam-Tests: AWL X-Spam-Learn: disabled X-Spam-Score: 0.0/3.0 X-Spam-Checker-Version: SpamAssassin 3.2.1 (2007-05-02) on tim.des.no Received: from ds4.des.no (des.no [80.203.243.180]) by smtp.des.no (Postfix) with ESMTP id 10481208A; Fri, 10 Aug 2007 13:15:20 +0200 (CEST) Received: by ds4.des.no (Postfix, from userid 1001) id ED8A68447F; Fri, 10 Aug 2007 13:15:19 +0200 (CEST) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Pietro Cerutti References: <86myx0pa9i.fsf@ds4.des.no> <46BC4309.8000802@gahr.ch> Date: Fri, 10 Aug 2007 13:15:19 +0200 In-Reply-To: <46BC4309.8000802@gahr.ch> (Pietro Cerutti's message of "Fri\, 10 Aug 2007 12\:50\:49 +0200") Message-ID: <86r6mb7i9k.fsf@ds4.des.no> User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/22.1 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: freebsd-hackers@freebsd.org Subject: Re: Core temperature X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 10 Aug 2007 11:15:23 -0000 Pietro Cerutti writes: > Could you please try to explain these results? > > % sysctl hw.coretemp.tjmax hw.coretemp.delta hw.acpi.thermal.tz0.temperat= ure > hw.coretemp.tjmax: 100 > hw.coretemp.delta: -38 > hw.acpi.thermal.tz0.temperature: 66.8C > > Shouldn't hw.coretemp.delta be (hw.coretemp.tjmax - > hw.acpi.thermal.tz0.temperature)? The value reported by hw.acpi.thermal.tz0.temperature most likely comes from a temperature sensor mounted somewhere on the motherboard, while hw.coretemp.delta reports the temperature inside the CPU itself. In my experience, Core-based CPUs run very cool under light load, so the result does not surprise me. here's what coretemp reports on my file server: hw.coretemp.tjmax: 100 hw.coretemp.delta: -46 although I believe this is actually one of the CPUs that have an 85=C2=B0C Tj(max), giving a core temperature of 39=C2=B0C and not 54=C2=B0C (the box = has a 2.4 GHz C2D but spends most of its time barely ticking over at 200 MHz) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no