From owner-freebsd-questions@FreeBSD.ORG Mon Jun 23 19:20:21 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 BBB9C106566B for ; Mon, 23 Jun 2008 19:20:21 +0000 (UTC) (envelope-from derek@computinginnovations.com) Received: from betty.computinginnovations.com (mail.computinginnovations.com [64.81.227.250]) by mx1.freebsd.org (Postfix) with ESMTP id 5FE278FC0A for ; Mon, 23 Jun 2008 19:20:20 +0000 (UTC) (envelope-from derek@computinginnovations.com) Received: from p28.computinginnovations.com (dhcp-10-20-30-100.computinginnovations.com [10.20.30.100]) (authenticated bits=0) by betty.computinginnovations.com (8.14.2/8.14.2) with ESMTP id m5NJK73Z093430; Mon, 23 Jun 2008 14:20:07 -0500 (CDT) (envelope-from derek@computinginnovations.com) Message-Id: <6.0.0.22.2.20080623141819.02568dd0@mail.computinginnovations.com> X-Sender: derek@mail.computinginnovations.com X-Mailer: QUALCOMM Windows Eudora Version 6.0.0.22 Date: Mon, 23 Jun 2008 14:19:57 -0500 To: hartzell@alerce.com, freebsd-questions@freebsd.org From: Derek Ragona In-Reply-To: <18527.62508.451095.415706@almost.alerce.com> References: <18527.62508.451095.415706@almost.alerce.com> Mime-Version: 1.0 X-Virus-Scanned: ClamAV 0.93/6806/Wed Apr 16 15:50:16 2008 on betty.computinginnovations.com X-Virus-Status: Clean X-ComputingInnovations-MailScanner-Information: Please contact the ISP for more information X-MailScanner-ID: m5NJK73Z093430 X-ComputingInnovations-MailScanner: Found to be clean X-ComputingInnovations-MailScanner-From: derek@computinginnovations.com X-Spam-Status: No Content-Type: text/plain; charset="us-ascii"; format=flowed X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: Subject: Re: CPU temp's on core 2 duo, should they be significantly different? 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, 23 Jun 2008 19:20:21 -0000 At 02:06 PM 6/23/2008, George Hartzell wrote: >DA Forsyth recently mentioned the coretemp driver, which fetches the >core temperatures for Core 2 Duo chips. > >I'm in the middle of building up a Shuttle SG31G2 (7-STABLE) and >loaded the driver to see what it told me. > >I've noticed that cpu.0 is consistently hotter than cpu.1, even on an >unloaded machine. Is that because that core's doing housekeeping work >whilst the other is truly idle? > >dev.cpu.0.temperature: 44 >dev.cpu.1.temperature: 29 > >If I background a pair of "dd if=/dev/urandom of=/dev/null" so that >the cpu's are busy, both go up but cpu.0 stays hotter. > >I'm asking because I'm worried that this could be a sign that I didn't >get the heatsink goop spread out sufficiently well.... > >Thanks, > >g. Not sure if the core duos work the same as older 2 CPU and 4 CPU motherboards, but there are some BIOS functions that always use the first CPU. So you never get true SMP because the hardware uses the first CPU more to service interrupts. -Derek -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.