Date: Thu, 09 Jan 2003 06:24:53 -0500 From: Jud <judmarc@fastmail.fm> To: Matthew Seaman <m.seaman@infracaninophile.co.uk>, questions@FreeBSD.ORG Subject: Re: FreeBSD and AMD power management Message-ID: <opriqcnrrn0cf2rk@fastmail.fm> In-Reply-To: <20030109085442.GA10394@happy-idiot-talk.infracaninophi> References: <20030108232002.G61746-100000@whitetower.gambrl01.md.comcast.net> <20030109085442.GA10394@happy-idiot-talk.infracaninophi>
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On Thu, 9 Jan 2003 08:54:42 +0000, Matthew Seaman <m.seaman@infracaninophile.co.uk> wrote: > On Wed, Jan 08, 2003 at 11:29:11PM -0500, J. Seth Henry wrote: >> I have noticed that my Compaq IA-1's (AMD K6-2/266 & VIA chipset) run >> substantially hotter under FreeBSD than under Linux. I didn't realize >> just >> how much until the machines began spontaneously rebooting under load. [snip] >> It doesn't appear to be a kernel panic - this machine has a thermal >> protection circuit which will hold the system in reset if it gets too >> warm, and so far, nothing has shown up in the logs (beyond the usual >> startup message regarding / being unmounted improperly). This leads me >> to >> believe that FreeBSD isn't issuing halts when it is idle, or the CPU is >> simply "idle" less. I have noticed that FreeBSD accesses the microdrive >> a >> *lot* (though Linux may be as well, but I can't hear it because it's >> running from flash) > > Try the ports/sysutils/fvcool port --- > http://www.nt.phys.kyushu-u.ac.jp/shimizu/ > > Using it has cut the average CPU temperature on my system from about > 70C to about 50C. I don't know if including options CPU_SUSP_HLT in your kernel will help fvcool work even better, but you might try it. I was using CPU_SUSP_HLT in my kernel; adding fvcool drops the average temp of my XP1800+ from 50C to 36C. The other thing to do, depending on whether you can take the machines offline (how many are there?), is to get a better heatsink and fan properly mounted on the CPU, and determine whether you can improve internal ventilation with case fans. -- Jud To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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