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 día Saturday, May 03, 2014 a las 04:59:48PM -0700, Kevin Oberman escribió:
>>>
>>>> On Sat, May 3, 2014 at 1:25 PM, Adrian Chadd <adrian_at_freebsd.org> wrote:
>>>>
>>>>> 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="Cmax"
>>>> economy_cx_lowest="Cmax"
>>>>
>>>> But, unless you want laggy performance, you will probably also want:
>>>> hint.p4tcc.0.disabled=1
>>>> hint.acpi_throttle.0.disabled=1
>>>> 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="YES"
>>> powerd_flags="-a max -b adp"
>>> #
>>> performance_cx_lowest="Cmax"
>>> economy_cx_lowest="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=C8 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=1 was already set
>> (apparently solves some issue with powerd on some AMD systems)
>>
>> I have added hint.p4tcc.0.disabled=1 but not sure where to expect to see
>> 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