cvs commit: src/sys/i386/cpufreq est.c

Maxim Sobolev sobomax at
Mon Mar 17 11:44:31 PDT 2008

Poul-Henning Kamp wrote:
> In message <200803170933.48212.jhb at>, John Baldwin writes:
>> On Monday 17 March 2008 05:01:43 am Poul-Henning Kamp wrote:
>>> phk         2008-03-17 09:01:43 UTC
>>>   FreeBSD src repository
>>>   Modified files:
>>>     sys/i386/cpufreq     est.c
>>>   Log:
>>>   Increase time we wait for things to settle to 1 millisecond,
>>>   10 microseconds is too short.
>>>   Always set the cpu to the highest frequency so that we get through
>>>   boot and don't handicap cpus where powerd(8) is not used.
>> Hmm, I actually consider this a feature when I'm not running powerd to use 
>> less battery.  I think we should only bump up the CPU on battery power when 
>> using powerd so that it can be lowered again to save battery power when the 
>> CPU is idle.
> We have cpufreq enabled by default now, badly configured machines run
> at 50% of rated CPU power because people don't know that they need to
> enable powerd(8) on servers.
> This is only going to get worse when more EnergyStar compliant servers
> hit the channel.
> I think setting full speed is the correct choice, if people care about
> powersaving, they need to configured it, if they don't they should get
> their moneys worth out of their hardware.

Perhaps make it a kernel option? But I agree that CPU should run at full 
speed by default, otherwise it would break POLA for users upgrading from 
previous releases.


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