Re: CPU C-state storange on Panasonic TOUGH BOOK CF-R9

Norikatsu Shigemura wrote:
> On Sun, 12 Sep 2010 11:12:20 +0300
> Alexander Motin <mav_at_freebsd.org> wrote:
>>>>> PROCESSOR-0696 [257314] cpu_cx_cst            : acpi_cpu3: C2[1] not available.
>>>>> PROCESSOR-0730 [257314] cpu_cx_cst            : acpi_cpu3: Got C3 - 245 latency
>>>> I think the issue is that C2 is not available for some reason and thus
>>>> C3 can't be used either. The way to tell is to use acpidump and look for
>>>> the CPU objects' _CST fields.
>>> The "not available" message means that transition latency is defined too high.
>>> That is, in this case latency is greater than 100 for C2.
>> Just an idea. Limits of 100 and 1000 are defined for detection of
>> C-states using P_LVLx_LAT registers. Because _CST explicitly specifies
> 
> 	Oops! I forgot. Thank you, I tried.
> 	But cx_lowest is not changed:
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
> $ sysctl -a | grep cx
> hw.acpi.cpu.cx_lowest: C1
> dev.cpu.0.cx_supported: C1/3 C2/245
> dev.cpu.0.cx_lowest: C1
> dev.cpu.0.cx_usage: 100.00% 0.00% last 3641us
> dev.cpu.1.cx_supported: C1/3 C2/245
> dev.cpu.1.cx_lowest: C1
> dev.cpu.1.cx_usage: 100.00% 0.00% last 798us
> dev.cpu.2.cx_supported: C1/3 C2/245
> dev.cpu.2.cx_lowest: C1
> dev.cpu.2.cx_usage: 100.00% 0.00% last 158us
> dev.cpu.3.cx_supported: C1/3 C2/245
> dev.cpu.3.cx_lowest: C1
> dev.cpu.3.cx_usage: 100.00% 0.00% last 227us
> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

hw.acpi.cpu.cx_lowest has default in C1. Have you tried to rise it via
sysctl?

-- 
Alexander Motin