freebsd-mobile Digest, Vol 539, Issue 2

[Warner Losh]

> On Feb 4, 2015, at 5:06 AM, Ian Smith <smithi at nimnet.asn.au> wrote:
> 
> On Wed, 4 Feb 2015 10:08:48 +0100, Lars Engels wrote:
>> On Wed, Feb 04, 2015 at 09:27:59AM +0200, PeerCorps Trust Fund wrote:
>>> Hi Lars,
>>> 
>>> Would you mind sharing what you are using for your powerd settings?
>> 
>> Sure. I followed the power saving tips from
>> https://wiki.freebsd.org/TuningPowerConsumption
>> and additionally run powerd with 
>> 
>> powerd_flags="-a hiadaptive -b hiadaptive"
> 
> Lars, are you running that with p4tcc and acpi_throttle both disabled?
> 
> That is, what says `sysctl dev.cpu.0.freq_levels`?
> 
> On my X200 it's '2401/35000 2400/35000 1600/15000 800/12000' and I found 
> hiadaptive rather aggressive, where adaptive works fine for my use - but 
> of course everybody's use is different :)
> 
> powerd_flags="-a adp -b adp -i 70 -r 90"

The X+1 number (in this case 2401) is the turbo-mode speed. If you use X, it disables
the Turbo mode which causes the CPU to run faster until it gets too hot. On my T400, I
found that if I limit powerd to X instead of X+1, I have fewer heat related issues when
I’m doing things like building a kernel…

Warner