From owner-freebsd-current@FreeBSD.ORG Mon Dec 10 20:48:50 2007 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 5CCC416A41A for ; Mon, 10 Dec 2007 20:48:50 +0000 (UTC) (envelope-from cracauer@koef.zs64.net) Received: from koef.zs64.net (koef.zs64.net [212.12.50.230]) by mx1.freebsd.org (Postfix) with ESMTP id E06EE13C461 for ; Mon, 10 Dec 2007 20:48:49 +0000 (UTC) (envelope-from cracauer@koef.zs64.net) Received: from koef.zs64.net (koef.zs64.net [212.12.50.230]) by koef.zs64.net (8.14.1/8.14.1) with ESMTP id lBAKB6jg091142; Mon, 10 Dec 2007 21:11:06 +0100 (CET) (envelope-from cracauer@koef.zs64.net) Received: (from cracauer@localhost) by koef.zs64.net (8.14.1/8.14.1/Submit) id lBAKB6qw091141; Mon, 10 Dec 2007 15:11:06 -0500 (EST) (envelope-from cracauer) Date: Mon, 10 Dec 2007 15:11:06 -0500 From: Martin Cracauer To: Thomas Sparrevohn Message-ID: <20071210201106.GB90158@cons.org> References: <200712081728.18710.Thomas.Sparrevohn@btinternet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200712081728.18710.Thomas.Sparrevohn@btinternet.com> User-Agent: Mutt/1.4.2.3i Cc: freebsd-current@freebsd.org Subject: Re: CURRENT Kernel makes the system run very very hot X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 10 Dec 2007 20:48:50 -0000 Thomas Sparrevohn wrote on Sat, Dec 08, 2007 at 05:28:18PM +0000: > > Hi > > There something weird going on - at minimal workloads my system gets very very hot - The system is watercooled, 4 Fan's etc > its a quad core QX6700 - make buildkernel - will make the fans run at highest speed (its impossibly to be in the room at the same time). > > There are no problems when running other OS'es - Are anybody else having this kind of problems (PS its a relatively new thing - maybe 2 weeks)? What does the coretemp module report for the real CPU temperature? I think it is perfectly normal for a buildkernel run to kick the CPU fan into highest gear. buildkernel is not a "minimal workload". buildkernel causes 100% load on one core even in non-parallel, and that one certainly gets hot. Since all 4 cores are in one CPU package, off the one CPU fan goes. I am curious why do you have temperature-controlled fans when you use watercooling. If the other OSes don't do this then they probably have some powermanagement going on and don't think that a buildkernel is worth kicking in high gear. You might want to compare with something that runs on both FreeBSD and Linux, such as a drystones run, or a Linux kernel compile (which you can run in FreeBSD's Linux emulation for comparision). Another way to track down a difference between FreeBSD and Linux is monitor the CPU frequency in /proc/cpuinfo on Linux. By default the Linux kernel on most distributions messes with that on Core2 systems. Martin -- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Martin Cracauer http://www.cons.org/cracauer/ FreeBSD - where you want to go, today. http://www.freebsd.org/