[ltp] What's cutting my CPU speed in half?

[John Sullivan]

This seems to be happening every now and then, and I can't figure out why:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 9
model name	: Intel(R) Pentium(R) M processor 1200MHz
stepping	: 5
cpu MHz		: 598.071
cache size	: 1024 KB
fdiv_bug	: no
hlt_bug		: no
f00f_bug	: no
coma_bug	: no
fpu		: yes
fpu_exception	: yes
cpuid level	: 2
wp		: yes
flags		: fpu vme de pse tsc msr mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 tm pbe up est tm2
bogomips	: 1197.25

Note the 598.071.

This is on:

Linux ashbery 2.6.18-1-686 #1 SMP Sat Oct 21 17:21:28 UTC 2006 i686 GNU/Linux

running Debian unstable.

I don't have any cpufreq modules or anything else I can think of that would be
throttling the CPU. 

ACPI: 

root@ashbery:/proc/acpi/processor/CPU# cat throttling
state count:             8
active state:            T0
states:
   *T0:                  00%
    T1:                  12%
    T2:                  25%
    T3:                  37%
    T4:                  50%
    T5:                  62%
    T6:                  75%
    T7:                  87%

root@ashbery:/proc/acpi/processor/CPU# cat power
active state:            C2
max_cstate:              C8
bus master activity:     00000000
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000] usage[00000010] duration[00000000000000000000]
   *C2:                  type[C2] promotion[C3] demotion[C1] latency[001] usage[00069171] duration[00000000000454056022]
    C3:                  type[C3] promotion[C4] demotion[C2] latency[085] usage[00018665] duration[00000000000112085411]
    C4:                  type[C3] promotion[--] demotion[C3] latency[185] usage[00071674] duration[00000000000513141643]


Is it maybe that power setting?

This is true on both battery and AC. Temperature seems to be fine:

root@ashbery:/proc/acpi/thermal_zone/THM0# cat temperature
temperature:             37 C

I noticed that last time I rebooted, the CPU speed was back to up to the
maximum again. So it's not always like this.

-- 
-John Sullivan
-http://www.wjsullivan.net
-GPG Key: AE8600B6