Date: Thu, 31 Jan 2008 05:35:15 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-acpi@freebsd.org Cc: "Alexandre \"Sunny\" Kovalenko" <alex.kovalenko@verizon.net> Subject: Re: [RFC] Patch to enable temperature ceiling in powerd Message-ID: <200801310535.15540.jhb@freebsd.org> In-Reply-To: <1201733779.902.18.camel@RabbitsDen> References: <1201733779.902.18.camel@RabbitsDen>
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On Wednesday 30 January 2008 05:56:19 pm Alexandre "Sunny" Kovalenko wrote: > Some time ago I have put together patch for powerd, which allows user to > specify the temperature threshold at which powerd will lower CPU > frequency no matter what the load was at the time. I recently had to > adapt it to the 7.0-PRERELEASE for someone with the overheating laptop, > which got me to think that it might be useful for someone else yet. > > Basic idea is fairly simple -- check temperature in TZ0 and, if it has > reached certain value, either override frequency with the lowest > available (in the case of 'max' setting) or change idle time to 100% and > let adaptive algorithm decrease frequency gradually. > > I imagine it also could be poor man's substitute for the low noise > acoustic policy ;) > > If there is an interest, I will go ahead and submit a PR, otherwise it > will live in the mail archives for someone to find. Any comments, > suggestions or criticisms are welcome. > > Temperature threshold (in Celsius) could be set by means of '-T' command > line option (as in '-T 60'). A couple of suggestions: - I would make the default temperature 0 instead of 200 and just disable the feature altogether if it is set to 0 (i.e. don't read the current temperature and don't do any checks if it is 0). - I would allow the temperature to be specified in either C, K or F with a suffix to indicate the scale. (e.g., "80C", "120F", "300K") - I would let the thermal zone name be configurable with a default of "tz0". (e.g. "-z tz3"). You would then snprintf the sysctl mib name that gets passed to sysctlbyname(3). -- John Baldwin
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