[RFC] Patch to enable temperature ceiling in powerd

[Alexandre "Sunny" Kovalenko]

On Fri, 2008-02-08 at 00:50 +0900, Hajimu UMEMOTO wrote:
> Hi,
> 
> >>>>> On Wed, 30 Jan 2008 17:56:19 -0500
> >>>>> "Alexandre \"Sunny\" Kovalenko" <alex.kovalenko at verizon.net> said:
> 
> alex.kovalenko> Some time ago I have put together patch for powerd, which allows user to
> alex.kovalenko> specify the temperature threshold at which powerd will lower CPU
> alex.kovalenko> frequency no matter what the load was at the time. I recently had to
> alex.kovalenko> adapt it to the 7.0-PRERELEASE for someone with the overheating laptop,
> alex.kovalenko> which got me to think that it might be useful for someone else yet.
> 
> alex.kovalenko> Basic idea is fairly simple -- check temperature in TZ0 and, if it has
> alex.kovalenko> reached certain value, either override frequency with the lowest
> alex.kovalenko> available (in the case of 'max' setting) or change idle time to 100% and
> alex.kovalenko> let adaptive algorithm decrease frequency gradually.
> 
> alex.kovalenko> I imagine it also could be poor man's substitute for the low noise
> alex.kovalenko> acoustic policy ;)
> 
> alex.kovalenko> If there is an interest, I will go ahead and submit a PR, otherwise it
> alex.kovalenko> will live in the mail archives for someone to find. Any comments,
> alex.kovalenko> suggestions or criticisms are welcome.
> 
> alex.kovalenko> Temperature threshold (in Celsius) could be set by means of '-T' command
> alex.kovalenko> line option (as in '-T 60').
> 
> Our kernel has passive cooling feature, already.  Is it not enough for
> you?
I must have missed it somehow, if you could, please, point me in the
right direction I will really appreciate it.
> 
> Sincerely,
> 
> --
> Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
> ume at mahoroba.org  ume@{,jp.}FreeBSD.org
> http://www.imasy.org/~ume/

-- 
Alexandre "Sunny" Kovalenko (Олександр Коваленко)