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1b1ed1a
(Get the code!)
I have tried to check C-states with powertop, but it says, that detailed information is only available for mobile processors (which mine is not - I think it is a desktop P4 HT crammed in a notebook).
cpuinfo shows:
...
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping : 3
cpu MHz : 3000.000
...
About the interrupts: on 2.6.20-15 I get about 300 timer interrupts/sec. On 2.6.22-14 the timer is very quiet - about 200 interrupts after 5 minutes uptime.