Greetings,
I am using a ThinkPad T61(T7500 CPU and NVS 140M Graphic Card), and
Ubuntu Linux with kernel version 2.6.24. Here is my powertop. I notice
that kernel_IPI takes a huge amount of wakeups. I have tried several
methods in Google,such as hpet=force kernel parameter and echo 1 >
/sys/devices/system/cpu/sched_mc_power_savings
in rc.local, but none of them works. 2.6.22 kernel does not have the
problem.
Any suggestions or comments?
Thanks,
shadowkernel
----------------------------------------------------------
PowerTOP version 1.9 (C) 2007 Intel Corporation
Cn Avg residency P-states (frequencies)
C0 (cpu running) (11.2%) 2.21 Ghz 9.6%
C1 0.0ms ( 0.0%) 2.21 Ghz 0.0%
C2 0.0ms ( 0.1%) 1.60 Ghz 0.0%
C3 1.2ms (88.7%) 800 Mhz 90.4%
Wakeups-from-idle per second : 755.4 interval: 10.0s
no ACPI power usage estimate available
Top causes for wakeups:
49.9% (556.0) <kernel IPI> : Rescheduling interrupts
15.5% (172.7) audacious : schedule_timeout (process_timeout)
8.6% ( 96.0) audacious : do_nanosleep (hrtimer_wakeup)
8.3% ( 92.0) <interrupt> : extra timer interrupt
5.5% ( 60.8) <interrupt> : uhci_hcd:usb3, nvidia
4.2% ( 46.9) <interrupt> : uhci_hcd:usb4, HDA Intel
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