Haswell, i3, fail to acpi_throttle fail

[Jung-uk Kim]

On 01/06/2015 17:08, Sean Bruno wrote:
> On 01/06/15 13:41, Jung-uk Kim wrote:
>> 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 useful for power management, it has long since been superseded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
> 
> Well, I'm running -current.  I don't know, for my case, that an MFC
> is correct.  Is it a bug that this stuff is appearing at all?

I think you need to merge the file to /boot/device.hints manually.

Jung-uk Kim