CPU Throttling

[Srikanth Konjarla]

Paul Johnson wrote:
> On 4/29/08, Srikanth Konjarla <srikanth.konjarla at gmail.com> wrote:
>> All,
>>
>> I run Fedora 8 on Tecra M5.
>>
>> http://www.smolts.org/show?uuid=pub_f72f9650-72f0-4d83-9c51-0cb13856226b
>>
>> It appears that the CPU throttling is not available.
> 
> On my Dell laptop, a cpuspeed package is running. look in
> system-config-services, see if you have it on.
> 
> I'm using a Nokia tablet now, don't have laptop here.
> 
> Other thought I have is that cpuspeed, rather than throttling, is the
> only thing i use anymore. AFAICR, throttling would leave unused
> cycles, which is   almost same as making the cpu slower.
I have enabled and running the cpuspeed daemon now. However, how do I 
monitor if "cpuspeed" is actually working?

Srikanth

> 
> 
> 
> While, the suspend
>> resume and function keys work (brightness, sound etc) wondering why the
>> CPU throttling does not work and i also suspect that causes the FAN to
>> run all the time. Is there a workaround or patch?
>>
>> Thanks
>>
>> # acpitool -c
>>    CPU type               : Intel(R) Core(TM)2 CPU         T7200  @ 2.00GHz
>>    Min/Max frequency      : 1000/2000 MHz
>>    Current frequency      : 1000 MHz
>>    Frequency governor     : ondemand
>>    Freq. scaling driver   : acpi-cpufreq
>>    Cache size             : 4096 KB
>>    Bogomips               : 3993.65
>>    Bogomips               : 3990.77
>>
>>    # of CPU's found       : 2
>>
>>    Processor ID           : 0
>>    Bus mastering control  : yes
>>    Power management       : yes
>>    Throttling control     : no
>>    Limit interface        : no
>>    Active C-state         : C0
>>    C-states (incl. C0)    : 4
>>    Usage of state C1      : 813 (0.1 %)
>>    Usage of state C2      : 60224 (11.0 %)
>>    Usage of state C3      : 485253 (88.8 %)
>>
>>    Processor ID           : 1
>>    Bus mastering control  : yes
>>    Power management       : yes
>>    Throttling control     : no
>>    Limit interface        : no
>>    Active C-state         : C0
>>    C-states (incl. C0)    : 4
>>    Usage of state C1      : 1247 (0.1 %)
>>    Usage of state C2      : 163294 (14.3 %)
>>    Usage of state C3      : 490818 (43.0 %)
>>
>> # cat /proc/acpi/processor/CPU0/throttling
>> <not supported>
>> # cat /proc/acpi/processor/CPU1/throttling
>> <not supported>
>>
>> # modinfo toshiba_acpi
>> filename:
>> /lib/modules/2.6.24.4-64.fc8/kernel/drivers/acpi/toshiba_acpi.ko
>> license:        GPL
>> description:    Toshiba Laptop ACPI Extras Driver
>> author:         John Belmonte
>> depends:
>> vermagic:       2.6.24.4-64.fc8 SMP mod_unload 686 4KSTACKS
>>
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> 
>