Hello, I have seen this phenomenon several times already and want to ask you about its cause. From time to time I am experiencing my Intel Core Duo T2250 CPU going mad. The average wakeups per second exceeds 22k (!). Here comes the output of powertop -d:
PowerTOP 1.8 (C) 2007 Intel Corporation
Collecting data for 15 seconds
Cn Avg residency
C0 (cpu running) (67.3%)
C1 0.0ms ( 0.0%)
C2 0.0ms (23.4%)
C3 0.0ms ( 9.3%)
P-states (frequencies)
1.74 Ghz 0.0%
1333 Mhz 0.0%
1067 Mhz 0.0%
800 Mhz 100.0%
Wakeups-from-idle per second : 22379.8 interval: 15.0s
Power usage (ACPI estimate): 14.5W (3.5 hours)
Top causes for wakeups:
24.6% ( 11.5) hald-addon-cpuf : queue_delayed_work_on
(delayed_work_timer_fn)
13.1% ( 6.1) Xorg : do_setitimer (it_real_fn)
10.4% ( 4.9) <interrupt> : extra timer interrupt
10.3% ( 4.8) <interrupt> : acpi
6.4% ( 3.0) multiload-apple : schedule_timeout (process_timeout)
6.3% ( 2.9) <kernel core> : queue_delayed_work_on
(delayed_work_timer_fn)
3.7% ( 1.7) gnome-panel : schedule_timeout (process_timeout)
2.4% ( 1.1) <interrupt> : eth0
2.3% ( 1.1) Xorg : schedule_timeout (process_timeout)
2.1% ( 1.0) dhcdbd : schedule_timeout (process_timeout)
2.1% ( 1.0) glunarclock-app : schedule_timeout (process_timeout)
2.1% ( 1.0) cpufreq-applet : schedule_timeout (process_timeout)
2.1% ( 1.0) nm-applet : schedule_timeout (process_timeout)
(...)
As you see, no process is responsible for these wakeups. And it is not a
simple display error of powertop:
tassadar:~# cat /proc/acpi/processor/CPU0/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[1101632640] duration[00000000054670700051]
C3: type[C3] promotion[--] demotion[C2]
latency[057] usage[317590412] duration[00000000103865822447]
Output for the second core is similar.
Please notice very high usage counters for C2 and C3 - and this is only
with 1 day uptime.
I am currently running 2.6.22.3 kernel (preparing for an update) but I
can remember seeing this with other kernel versions too.
The problem is unfortunately non-deterministic. This strange behavior of
CPU happens from time to time and after reboot everything is back to
normal. I cannot notice any particular actions leading into this.
Could you please help me with finding and eliminating cause of this
problem?
smime.p7s
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