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https://bugzilla.novell.com/show_bug.cgi?id=335086#c3





--- Comment #3 from Morten Welinder <mwelinder@xxxxxxxxx>  2007-10-24 16:38:12 
MST ---
# cat /proc/acpi/processor/*/power
active state:            C2
max_cstate:              C8
bus master activity:     00000000
maximum allowed latency: 8000 usec
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[001]
usage[00000010] duration[00000000000000000000]
   *C2:                  type[C2] promotion[C3] demotion[C1] latency[001]
usage[01185035] duration[00000000000033151654]
    C3:                  type[C3] promotion[--] demotion[C2] latency[057]
usage[00301205] duration[00000000000010402063]


# echo 2 >/sys/module/processor/parameters/max_cstate
# Does it work normal then?

Nope.  In fact, it appears to double to wakeup count to nearly 60000/s.

# echo 1 >/sys/module/processor/parameters/max_cstate

That seems to work -- in the sense, that the wakeup count is not insane.
According to topertop, the machine stays in C0 all the time.

> What kind of CPU/machine is that?

Toshiba Satellite M105-S3041

# cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU           T1350  @ 1.86GHz
stepping        : 8
cpu MHz         : 797.903
cache size      : 2048 KB
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe constant_tsc up pni monitor
est tm2 xtpr
bogomips        : 3728.19
clflush size    : 64


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