Haswell, i3, fail to acpi_throttle fail

[Sean Bruno]

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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:
>> 
>>> 
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>>> 
>>> 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 management, it has long since been superseded by TCC.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?

sean

FreeBSD bruno 11.0-CURRENT FreeBSD 11.0-CURRENT #11 r276355M: Mon Jan
 5 17:52:37 PST 2015     sbruno at bruno:/usr/obj/usr/src/sys/BRUNO  amd64

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