shadowkernel wrote: > 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)
very likely the IPI's are a consequence of the audcious process doing a lot of work.. I bet if you stop audacious they'll either go away or way down. _______________________________________________ Discuss mailing list [email protected] http://mail.lesswatts.org/mailman/listinfo/discuss
