Patches to add minimum and maximum frequencies to powerd(8)

Rui Paulo rpaulo at
Wed Aug 13 16:02:03 UTC 2008

On Wed, Aug 13, 2008 at 10:23:58AM -0400, Boris Kochergin wrote:
> Hi, list. A friend asked me if it was possible to tell powerd(8) not to 
> throttle lower than a certain frequency, so I hacked something up, then 
> thought I'd try my hand at a more proper implementation of minimum and 
> maximum frequency specifications, as I recall similar requests on other 
> lists.
> For interested parties, the patches can be found at 
> and are against RELENG_7_0 sources, but 
> the changes should be the same for -CURRENT. Comments are welcome.

See the cpufreq(4) man page:

             Lowest CPU frequency in MHz to offer to users.  This setting is
             also accessible via a tunable with the same name.  This can be
             used to disable very low levels that may be unusable on some sys-

I think this is what you want.

Rui Paulo

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