Massive number of unexplained wakeups on Thinkpad X60s

[Arjan van de Ven]

John Fremlin wrote:

> For a very simple example: suppose the CPU enters state C1. Then
> cur_usage[1]=1. Now suppose that it stays there for a few
> milliseconds. It will automatically fall down to C2.


actually.. it will not unless the OS kernel wakes up, executes code 
and then selects C2. Even if the HW would change C-states under you, 
the counters wouldn't be updated to reflect that because it's the 
kernel that does that counting pretty much ;)

> So
> cur_usage[2]=1. Then there is a wake-up and it goes back to C0. Your
> calculation will say there were two wake-ups.

because there were two...