Wu, Jackie wrote:
> For the kernel IPI, it's the inter processor interrupt between CPU
> cores. Does it really mean the interrupts to wake up the system? 

actually it does.
It wakes up the core if it was idle (asleep) before.

> And I'm not sure if different cores in Intel Core2 Due CPU can sleep
> separately. 

they can, to some degree. (it's a little complex; they can go to some level of 
sleep
independently, but if they are both sleeping you get some "bonus" power savings)

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