Date: Fri, 27 Jul 2007 16:43:29 +0200 From: Pietro Cerutti <gahr@gahr.ch> To: freebsd-hackers@freebsd.org Subject: [patch] enhance powerd(8) to handle max temperature Message-ID: <46AA0491.5000203@gahr.ch>
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Hi list, here is a patch to allow powerd(8) accept a "-t tval" option to set a temperature limit above which performance should be decreased. It's a first draft, and I identified the following problems: - the CPU temperature takes some time to decrease, so powerd keeps decreasing the CPU frequency until the temperature is below the limit. The effect is a "increase to maximum, decrease to minimum, increase to maximum, decrease to minimum, ...." which may not be desirable. - the temperature is retrieved by the hw.acpi.thermal.tz0.temperature sysctl MIB. Support for other methods would be desirable. The patches to powerd.c and powerd.8 are here: http://www.gahr.ch/FreeBSD/patches/powerd.c.diff http://www.gahr.ch/FreeBSD/patches/powerd.8.diff Any comment is welcome! -- Pietro Cerutti PGP Public Key: http://gahr.ch/pgp
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