cvs commit: src/usr.sbin/powerd powerd.c

Nate Lawson nate at
Tue Aug 30 05:08:28 GMT 2005

Bruno Ducrot wrote:
> On Sun, Aug 28, 2005 at 10:36:38PM -0700, Nate Lawson wrote:
>>Another mitigating factor is a patch I hope to commit soon that removes 
>>levels that aren't useful.  The general idea is the same as a recent 
>>email from Tijl Coosemans but my approach is different.
> I'm pretty sure it's incorrect to add p4tcc and acpi_throttle for power
> saving purpose.  I plan to add some flags in order to use only relevant
> frequencies to this end, but IMHO that should be done at low-level
> drivers.  On the other hand, it is usefull to keep the existing sysctl
> freqs, but for cooling purpose only.

I think throttling, whether via p4tcc or acpi_throttle, is a useful 
addition to absolute frequency control (i.e. est or powernow).  With 
appropriate tuning, as I hope the patch I committed provides, the 
additional levels should be helpful.


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