Re: [Bug 8243] Problem with Throttling and CPU power state

["Rafał Bilski" <rafalbilski@interia.pl>]

> This bug is present in kernel 2.6.22(.1,2,3,4,5) too :(
I don't get it. Where is the bug?
> Why my CPU is not in C1 state, when works on 100%? And where is C0 state?
C0 means that CPU is working so it isn't listed.
I think that You have misunderstood this file. It isn't printing current 
CPU state. It is listing all available sleep states in order from 
low latency and higher power consumption to high latency and lower power 
consumption. Star means state that will be used when CPU become idle. 
"Latency" means time needed to enter sleep state and time needed to wakeup 
when something will happen (interrupt or BM DMA for example). So it is 
perfectly OK to use C4 when there it isn't much to do and C2 when CPU is 
spending less time sleeping.
Kernel compilation isn't causing 100% CPU usage. Processor is sleeping 
during I/O wait. Well, unless You are using -j2 or higher.
> state T4 is activated, but only a few seconds and then it goes back to T0. Is
> this ok?
Yes. BIOS option "use throttling to rescue CPU when it is overheating" 
interfering.

Regards
Rafa³

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