Re: Leaving the Desktop Market

On 05/04/14 10:05, Allan Jude wrote:
> On 2014-05-04 11:47, Allan Jude wrote:
>> On 2014-05-04 10:28, Matthias Apitz wrote:
>>> El d=EDa Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberman e=
scribi=F3:
>>>
>>>> On Sat, May 3, 2014 at 1:25 PM, Adrian Chadd <adrian@freebsd.org> wrot=
e:
>>>>
>>>>> Set it to the lowest available Cx state that you see in dev.cpu.0 .
>>>>>
>>>>>
>>>> Available is not required. Set it to C8. That guarantees that you will=
 use
>>>> the lowest available. The correct incantation in rc.conf is "Cmax".
>>>> performance_cx_lowest=3D"Cmax"
>>>> economy_cx_lowest=3D"Cmax"
>>>>
>>>> But, unless you want laggy performance, you will probably also want:
>>>> hint.p4tcc.0.disabled=3D1
>>>> hint.acpi_throttle.0.disabled=3D1
>>>> in /boot/loader.conf. Low Cx states and TCC/throttling simply don't mix
>>>> well and TCC is not effective, as mentioned earlier in this thread.
>>> Re/ powerd I have in /etc/rc.conf:
>>>
>>> # powerd
>>> powerd_enable=3D"YES"
>>> powerd_flags=3D"-a max -b adp"
>>> #
>>> performance_cx_lowest=3D"Cmax"
>>> economy_cx_lowest=3D"Cmax"
>>>
>>> (and the additional hint.* in /boot/loader.conf as well). Which process
>>> 'performance_cx_lowest' and 'economy_cx_lowest' target exactly as config
>>> values?
>>>
>>> Thx
>>>
>>> 	matthias
>>>
>> In a pretty unscientific test on my laptop (Lenovo T530 with Intel i5
>> 3320M), setting hw.acpi.cpu.cx_lowest=3DC8 lowered power consumption at
>> idle by about 3 watts, which adds about 30-45 minutes to my battery life
>> during conservative usage.
>>
>> Using PCBSD 10, so hint.acpi_throttle.0.disabled=3D1 was already set
>> (apparently solves some issue with powerd on some AMD systems)
>>
>> I have added hint.p4tcc.0.disabled=3D1 but not sure where to expect to s=
ee
>> a difference.
>>
> I see the difference now, with the p4tcc stuff disabled, the lowest
> cpufreq is now 1200mhz instead of 150mhz
>
>

I just set the default for acpi_throttle and p4tcc in HEAD to disabled =

by adding these line to the default /boot/device.hints. If you want them =

back, editing your device.hints will restore them. This can be reverted =

if many people want throttling enabled by default, but all I have heard =

so far -- and for the past many years -- is a unanimous chorus to turn =

it off.
-Nathan
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