From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1Ogowg-0001Gr-Cj for garchives@archives.gentoo.org; Thu, 05 Aug 2010 01:08:30 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 7CADFE0AEA for ; Thu, 5 Aug 2010 01:08:29 +0000 (UTC) Received: from outbound.icp-qv1-irony-out3.iinet.net.au (outbound.icp-qv1-irony-out3.iinet.net.au [203.59.1.148]) by pigeon.gentoo.org (Postfix) with ESMTP id AD12FE090E for ; Thu, 5 Aug 2010 00:39:46 +0000 (UTC) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AnEFAEmlWUzLzg3j/2dsb2JhbACDFZAzjGJxs0yRYIEmgyJzBIQcKYc2 X-IronPort-AV: E=Sophos;i="4.55,318,1278259200"; d="scan'208";a="629132769" Received: from unknown (HELO moriah.localdomain) ([203.206.13.227]) by outbound.icp-qv1-irony-out3.iinet.net.au with ESMTP; 05 Aug 2010 08:39:44 +0800 Received: from localhost (localhost [127.0.0.1]) by moriah.localdomain (Postfix) with ESMTP id 2E2AD1DB04E1 for ; Thu, 5 Aug 2010 08:39:44 +0800 (WST) X-Virus-Scanned: amavisd-new at localdomain Received: from moriah.localdomain ([127.0.0.1]) by localhost (moriah.localdomain [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id JtYMoOnJo57f for ; Thu, 5 Aug 2010 08:39:40 +0800 (WST) Received: from [192.168.48.1] (troll [192.168.48.1]) by moriah.localdomain (Postfix) with ESMTP id 96B231DB04E0 for ; Thu, 5 Aug 2010 08:39:40 +0800 (WST) Subject: Re: [gentoo-user] Re: lm_sensors show 2 different temp. for my CPU From: Bill Kenworthy To: gentoo-user@lists.gentoo.org In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Date: Thu, 05 Aug 2010 08:39:40 +0800 Message-ID: <1280968780.8670.57.camel@troll> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 X-Mailer: Evolution 2.28.3.1 Content-Transfer-Encoding: 7bit X-Archives-Salt: 79b01de1-7364-4e54-be7d-c5c7d4781667 X-Archives-Hash: 7e370cc00993edbbcb229f4f3d701a96 On Wed, 2010-08-04 at 18:22 +0300, Nikos Chantziaras wrote: > On 08/04/2010 02:14 PM, Xi Shen wrote: > > hi, > > > > after i setup lm_sensors on my gentoo amd64, i ran sensors, and got > > the below output > > > > coretemp-isa-0000 > > Adapter: ISA adapter > > Core 0: +61.0 C (high = +74.0 C, crit = +100.0 C) > > > > coretemp-isa-0001 > > Adapter: ISA adapter > > Core 1: +61.0 C (high = +74.0 C, crit = +100.0 C) > > This is the sensor inside the CPU. The kernel doesn't know how to > interpret this value on non-mobile CPUs, and it's usually off by 10C to > 15C on desktop CPUs. > > > > CPU Temperature: +49.0 C (high = +90.0 C, crit = +125.0 C) > > This is the sensor on your motherboard that resides directly under the > CPU. This an accurate temp and the kernel knows exactly how to > interpret the values. > > This is windows specific but has lots on how Intel/AMD work. http://www.alcpu.com/CoreTemp/ This page seems to imply that Linux's use of coretemp is not as "detailed" as available to windoze users and if an unknown cpu will use a default value which may be incorrect. http://www.mjmwired.net/kernel/Documentation/hwmon/coretemp The lm_sensor temperatures (and voltages) are always highly suspect, usually being based on users experiments rather than manufacturer information which is usually not available. Also, I suspect variation even between motherboards of the same type as sometimes the supposed lm_sensors values for one of my systems (often cpu voltage) are not even close. BillK