Haswell, i3, fail to acpi_throttle fail

[Jung-uk Kim]

On 01/05/2015 22:57, Kevin Oberman wrote:
> On Mon, Jan 5, 2015 at 4:56 PM, Sean Bruno
> <sbruno at ignoranthack.me> wrote:
> 
>> 
>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512
>> 
>> acpi_throttle0: <ACPI CPU Throttling> on cpu0 acpi_throttle0: 
>> P_CNT from P_BLK 0x1810 est0: <Enhanced SpeedStep Frequency 
>> Control> on cpu0 acpi_throttle1: <ACPI CPU Throttling> on cpu1 
>> acpi_throttle1: failed to attach P_CNT device_attach: 
>> acpi_throttle1 attach returned 6 est1: <Enhanced SpeedStep 
>> Frequency Control> on cpu1 acpi_throttle2: <ACPI CPU Throttling> 
>> on cpu2 acpi_throttle2: failed to attach P_CNT device_attach: 
>> acpi_throttle2 attach returned 6 est2: <Enhanced SpeedStep 
>> Frequency Control> on cpu2 acpi_throttle3: <ACPI CPU Throttling> 
>> on cpu3 acpi_throttle3: failed to attach P_CNT device_attach: 
>> acpi_throttle3 attach returned 6 est3: <Enhanced SpeedStep 
>> Frequency Control> on cpu3
>> 
>> 
>> The call to acpi_bus_alloc_gas() in acpi_throttle.c seems to be 
>> failing to attach.  What should I be poking at here?
>> 
> 
> Excellent! Throttling is counter-productive and always has been. 
> It's been at least 5 years since mav@ posted his excellent wiki 
> article on power management which demonstrated the futility of 
> throttling. More important, even if it was useful for power 
> management, it has long since been superseded by TCC.  Intel tried 
> to make the purpose of TCC clear by the name: Thermal Control 
> Circuit. So it is ineffective for power management and FreeBSD 
> still tries to use it. Looks like the vendor broke ACPI so 
> throttling won't work. Or, maybe, Intel simply removed it as
> unused legacy.
> 
> Don't worry.  Be happy! Make sure that 
> hint.acpi_throttle.0.disabled=1 is set in /boot/loader.conf to 
> disable it. I'd strongly urge that you also disable P4TCC with 
> hint.p4tcc.0.disabled=1. It will trivially improve battery life
> and will seriously compromise performance if powerd is enabled. It
> can also cause hangs with elevated C-states on some systems.

FYI, acpi_throttle and tcc have been disabled by default for a while.

https://svnweb.freebsd.org/changeset/base/265329

I guess Nathan forgot to MFC this commit?

Jung-uk Kim