From owner-freebsd-current@FreeBSD.ORG Thu Mar 3 01:37:16 2005 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5530416A4CE; Thu, 3 Mar 2005 01:37:16 +0000 (GMT) Received: from www.cryptography.com (li-22.members.linode.com [64.5.53.22]) by mx1.FreeBSD.org (Postfix) with ESMTP id 08AA143D41; Thu, 3 Mar 2005 01:37:16 +0000 (GMT) (envelope-from nate@root.org) Received: from [10.0.0.34] (adsl-67-119-74-222.dsl.sntc01.pacbell.net [67.119.74.222]) by www.cryptography.com (8.12.8/8.12.8) with ESMTP id j231b5Zj015068 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Wed, 2 Mar 2005 17:37:06 -0800 Message-ID: <42266A41.2010907@root.org> Date: Wed, 02 Mar 2005 17:37:05 -0800 From: Nate Lawson User-Agent: Mozilla Thunderbird 1.0 (Windows/20041206) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Kevin Oberman References: <20050302235623.BA3925D07@ptavv.es.net> In-Reply-To: <20050302235623.BA3925D07@ptavv.es.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit cc: acpi@FreeBSD.ORG cc: current@FreeBSD.ORG Subject: Re: patch: p4tcc and speedstep cpufreq drivers X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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: Thu, 03 Mar 2005 01:37:16 -0000 Kevin Oberman wrote: >>Date: Wed, 02 Mar 2005 15:28:52 -0800 >>From: Nate Lawson >>If you look elsewhere, the design is stated more clearly and shows the >>reading that enabling On-Demand disables Automatic mode is incorrect. >> >>Intel Software Developer's Manual, Volume 3, 13.15.3: >>"If on-demand clock modulation and TM1 are both enabled and the thermal >>status of the processor is hot ..., clock modulation at the duty cycle >>specified by TM1 takes precedence, regardless of the setting of the >>on-demand clock modulation duty cycle." >> >>Empirical testing shows TM1 kicks in around 75C and THERMTRIP is >>somewhere near 100C. The separate THERMTRIP feature disables the >>processor completely if TM1 or 2 fail to stop the temperature from rising. >> >>http://www.digit-life.com/articles2/p4-throttling/ > > > OK. This makes me feel a bit better, but I still think I'll leave TCC > out of the equation as it makes the various frequency steps vary uneven > to the point that lowering dev.cpu.0.freq would increase performance > (and the reverse, as well) and it causes my system to hang when > throttled back too far. It never hangs with TCC disabled although my > lowest "frequency" is now just 150 MHz. > > By the way, I am still delighted in the cpufreq addition to the system. > It gives me excellent control of CPU speed to stretch my battery life. > All I really need is a desktop tool (maybe a gnome applet) to let me > adjust freq easily. I may just try to write that myself if I get some > time before someone else gets to it. I'll try to see if I can find a way to notice bad states and disable them automatically. Perhaps your CPU has some errata. Regarding the gnome applet, too late, marcus@ has done that. :) -- Nate