From owner-freebsd-questions@FreeBSD.ORG Tue Oct 7 13:25:30 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 DF2571065687 for ; Tue, 7 Oct 2008 13:25:30 +0000 (UTC) (envelope-from frank@esperance-linux.co.uk) Received: from mailout.zetnet.co.uk (mailout.zetnet.co.uk [194.247.47.231]) by mx1.freebsd.org (Postfix) with ESMTP id 6ED1C8FC28 for ; Tue, 7 Oct 2008 13:25:30 +0000 (UTC) (envelope-from frank@esperance-linux.co.uk) Received: from irwell.zetnet.co.uk ([194.247.47.48] helo=zetnet.co.uk) by mailout.zetnet.co.uk with esmtp (Exim 4.63) (envelope-from ) id 1KnCZ2-0007ph-BM; Tue, 07 Oct 2008 14:25:24 +0100 Received: from melon.esperance-linux.co.uk (54-144.adsl.zetnet.co.uk [194.247.54.144]) by zetnet.co.uk (8.14.1/8.14.1/Debian-9) with ESMTP id m97DPMnJ010044; Tue, 7 Oct 2008 14:25:23 +0100 Received: by melon.esperance-linux.co.uk (Postfix, from userid 1001) id 4F4BAFCA4AD; Tue, 7 Oct 2008 14:25:17 +0100 (BST) Date: Tue, 7 Oct 2008 14:25:17 +0100 From: Frank Shute To: Kirk Strauser Message-ID: <20081007132517.GA31229@melon.esperance-linux.co.uk> Mail-Followup-To: Kirk Strauser , FreeBSD Questions ML References: Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.4.2.3i X-Face: *}~{PHnDTzvXPe'wl_-f%!@+r5; VLhb':*DsX%wEOPg\fDrXWQJf|2\,92"DdS%63t*BHDyQ|OWo@Gfjcd72eaN!4%NE{0]p)ihQ1MyFNtWL X-Operating-System: FreeBSD 6.3-RELEASE-p2 i386 X-Organisation: 'http://www.shute.org.uk/' X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (zetnet.co.uk [194.247.46.1]); Tue, 07 Oct 2008 14:25:23 +0100 (BST) Cc: FreeBSD Questions ML Subject: Re: Coretemp seems to be off quite a bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: Frank Shute List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 07 Oct 2008 13:25:31 -0000 On Mon, Oct 06, 2008 at 09:39:40AM -0500, Kirk Strauser wrote: > > I have a Gigabyte motherboard with an Intel ICH-9 chipset, and a > 3.0GHz Core 2 Duo (E8400). The coretemp sysctls seem to always show > 50C as the baseline temperature: > > $ sysctl dev.cpu | grep temp > dev.cpu.0.temperature: 50 > dev.cpu.1.temperature: 50 > > This is with a big PSU fan, a good CPU fan, a clean heatsink, and two > case fans aimed the right direction (front fan pulling cool air in, > rear fan pushing warm air out). If I reboot and go into the BIOS, I > get numbers around 42-43C. I know it's kind of hard to compare > directly, but the coretemp numbers are from a totally idle system with > powerd scaling it back to 373MHz, so it should be as cool as when > sitting idle in the BIOS screens. When I work the system hard, like > running "make -j4 buildworld", I see temperatures up around 63-64C, > and I'm almost positive that's not right. > > Any ideas why coretemp and the BIOS would show such different numbers? To add some numbers, I've got an E6550 on a Gigabyte GA-P35-DS3L (ICH9) and I get: $ sysctl dev.cpu | grep temp dev.cpu.0.temperature: 24 dev.cpu.1.temperature: 28 Ambient room temp: 23°C That's running powerd and the machine idle, standard heatsink/fan combo, 1x12cm case fan. Your's might run hotter (higher clock speed? Mine: 2.33GHz) but I wouldn't expect it to run *so* much hotter. I'd expect your numbers to be right if all the ACPI stuff is working. To confirm this, check in Windows, if you can: http://www.techpowerup.com/realtemp/ Tom's hardware has some stuff about Intel temps: http://www.tomshardware.co.uk/forum/221745-11-core-quad-temperature-guide If that is high too and is outside the proper temperature envelope for your CPU, that leaves a possibility that your heatsink/fan might not be seated properly. What we could do with is some numbers from somebody running a similar CPU. Regards, -- Frank Contact info: http://www.shute.org.uk/misc/contact.html