Failed to attach P_CNT - FreeBSD 9.1 RC3

[Shiv. Nath]

Dear FreeBSD Community Friends,

It is FreeBSD 9.1 RC3, i get the following warning in the message log
file. i need assistance to understand the meaning of this error, how
serious is it?

acpi_throttle23: failed to attach P_CNT

History:
This error is following FreeBSD for long time because when i was googled
the error. i can across a post that was belongs to FreeBSD 6x.
http://tgrove.com/2007/10/07/freebsd-6-acpi_throttle1-failed-to-attach-p_cnt/

They Provided the solution as well but did not work. They also said that
is is only happening with Intel dual core processor but that is not true.
As it is virtual machine, i tried to restore the FreeBSD VM on three
different servers, those having different specification of processors
(dual cores, quad cores, six cores) still the same then decided to consult
with experts.


Following was the solution but did not remove the error/warning


vi /boot/device.hints
# Add this to the end of the file
hint.acpi_throttle.0.disabled="1"

vi /boot/loader.conf
# Add this to the end of the file
hint.acpi_throttle.0.disabled=”1″


Thanks / Shiv. Nath

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[John Baldwin]

On Sunday, November 04, 2012 05:56:33 AM Shiv. Nath wrote:
> Dear FreeBSD Community Friends,
>
> It is FreeBSD 9.1 RC3, i get the following warning in the message log
> file. i need assistance to understand the meaning of this error, how
> serious is it?
>
> acpi_throttle23: failed to attach P_CNT

On newer CPUs that use est you don't want to use acpi_throttle anyway so you
can ignore the errors. (est gives you power savings when it lowers your CPU
speed, acpi_throttle generally does not, it only helps with lowering the
temperature)

--
John Baldwin