Re: CPU Throttling

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On 4/29/08, Srikanth Konjarla <srikanth.konjarla@xxxxxxxxx> 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.



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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-- 
Paul E. Johnson
Professor, Political Science
1541 Lilac Lane, Room 504
University of Kansas

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