[ltp] Deep CPU Cx states

[Andrew Barr]

On Friday 14 July 2006 13:13, Henrique de Moraes Holschuh wrote:
> I never seen C4 in a ThinkPad, actually. 

andrew@r51:~$ cat /proc/acpi/processor/CPU/power
active state:            C2
max_cstate:              C8
bus master activity:     fffffe5f
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000] 
usage[00000010]
   *C2:                  type[C2] promotion[C3] demotion[C1] latency[001] 
usage[03142315]
    C3:                  type[C3] promotion[--] demotion[C2] latency[085] 
usage[00191511]

* here I unplugged the AC adapter *

andrew@r51:~$ cat /proc/acpi/processor/CPU/power
active state:            C1
max_cstate:              C8
bus master activity:     ffffffbe
states:
   *C1:                  type[C1] promotion[C2] demotion[--] latency[000] 
usage[00000000]
    C2:                  type[C2] promotion[C3] demotion[C1] latency[001] 
usage[00000000]
    C3:                  type[C3] promotion[C4] demotion[C2] latency[085] 
usage[00000000]
    C4:                  type[C3] promotion[--] demotion[C3] latency[185] 
usage[00000000]

Processor is a 1.6GHz Intel Pentium M (Dothan, I believe)

I've seen it go to C4, but right now it isn't going to go anywhere near there 
because I'm running an ARM cross-compile job, 'apt-get dist-upgrade' inside a 
QEMU Debian VM, playing music with amaroK, and typing this mail. :)

-- 
Andrew Barr | http://www.oakcourt.dyndns.org/~andrew/ | GPG: 0xAD9AE76A
"Those who would trade liberty for security deserve neither." -- B. Franklin