From owner-freebsd-questions@FreeBSD.ORG Mon Jun 23 19:06:22 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 D8D771065673 for ; Mon, 23 Jun 2008 19:06:22 +0000 (UTC) (envelope-from hartzell@alerce.com) Received: from merlin.alerce.com (merlin.alerce.com [64.62.142.94]) by mx1.freebsd.org (Postfix) with ESMTP id BC3DF8FC1D for ; Mon, 23 Jun 2008 19:06:22 +0000 (UTC) (envelope-from hartzell@alerce.com) Received: from merlin.alerce.com (localhost [127.0.0.1]) by merlin.alerce.com (Postfix) with ESMTP id EE09433C62 for ; Mon, 23 Jun 2008 12:06:41 -0700 (PDT) Received: from postfix.alerce.com (w092.z064001164.sjc-ca.dsl.cnc.net [64.1.164.92]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by merlin.alerce.com (Postfix) with ESMTP id B16FC33C5B for ; Mon, 23 Jun 2008 12:06:41 -0700 (PDT) Received: by postfix.alerce.com (Postfix, from userid 501) id 7E49C459036; Mon, 23 Jun 2008 12:06:20 -0700 (PDT) From: George Hartzell MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <18527.62508.451095.415706@almost.alerce.com> Date: Mon, 23 Jun 2008 12:06:20 -0700 To: freebsd-questions@freebsd.org X-Mailer: VM 7.19 under Emacs 22.1.50.1 X-Virus-Scanned: ClamAV using ClamSMTP Subject: 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 Reply-To: hartzell@alerce.com List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 23 Jun 2008 19:06:22 -0000 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.