Date: Mon, 30 Jul 2007 18:25:12 -0700 From: Nate Lawson <nate@root.org> To: Hajimu UMEMOTO <ume@freebsd.org> Cc: acpi@freebsd.org, freebsd-hackers@freebsd.org, Pietro Cerutti <gahr@gahr.ch> Subject: Re: [patch] enhance powerd(8) to handle max temperature Message-ID: <46AE8F78.1060203@root.org> In-Reply-To: <yge4pjl1i7f.wl%ume@mahoroba.org> References: <46AA0491.5000203@gahr.ch> <yge7iol6zb8.wl%ume@mahoroba.org> <46ADAF5B.6050602@gahr.ch> <20070730180355.GA7355@rot26.obsecurity.org> <46AE58B5.3080506@gahr.ch> <yge4pjl1i7f.wl%ume@mahoroba.org>
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Hajimu UMEMOTO wrote: >>>>>> On Mon, 30 Jul 2007 23:31:33 +0200 >>>>>> Pietro Cerutti <gahr@gahr.ch> said: > gahr> My patch is really just a first draft that I wrote in order to have > gahr> feedbacks on the general idea to implement a temperature controlling > gahr> system inside powerd, and doesn't implement hysteresis as you noted, and > gahr> your feedback is that it's not a good idea, which I respect. > > It is rather backward, IMHO. I did implement a passive cooling > feature as an enhancement of powerd(8) like you did, during initial > phases. Then, I implemented it in our kernel as a result. I'll take a look at your patch. Umemoto-san is right in that you really want the kernel to control cooling. What happens if powerd dies/hangs and your system burns up? Passive cooling is often a last resort to keep the system from overheating. -Nate
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