Never in C3

Fred Labrosse
2004-06-14T13:06:30Z

All,

The following seems to suggest that my processor is never in C3 state:

# cat /proc/acpi/processor/CPU0/power
active state: C1
default state: C1
bus master activity: db66ffff
states:
*C1: promotion[C2] demotion[--] latency[000] usage[02058670]
C2: promotion[C3] demotion[C1] latency[020] usage[19743630]
C3: promotion[--] demotion[C2] latency[200] usage[00000000]

Right?

I did read at some point that this was because of hotplug. I thus stopped
hotplug and, at that time, I did see my processor in C3 state. Hoever,
since then, I've never seen that again, and hotplug is not running.

And yes, C3 is claimed to be supported (from dmesg:

ACPI: Processor [CPU0] (supports C1 C2 C3, 8 throttling states)
)

Anything else that could cause that? Any hints?

Cheers,

Fred

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