Comment 27 for bug 177895

Hi,

System is completly idle:

root@robxps:/# grep CONFIG_SCHED_MC /boot/config-2.6.24-5-generic
CONFIG_SCHED_MC=y
root@robxps:~# echo 1 > /sys/devices/system/cpu/sched_mc_power_savings
root@robxps:/sys/devices/system/cpu# cat sched_mc_power_savings
1

Powertop Screenshot:

     PowerTOP version 1.9 (C) 2007 Intel Corporation

Cn Verweildauer P-States (Frequenzen)
C0 (Prozessor läuft) ( 7,4%) 1,81 GHz 0,0%
C1 0,0ms ( 0,0%) 1,80 GHz 0,0%
C2 0,0ms ( 0,4%) 1200 MHz 0,0%
C3 1,7ms (92,2%) 800 MHz 100,0%

Aufwachen pro Sekunde : 671,5 Intervall: 10,0s
Stromverbrauch (nach ACPI): 17,3W (0,6 Std.)

Häufigste Ursachen für das Aufwachen:
  91,4% (1190,8) <kernel IPI> : Rescheduling interrupts
   1,8% ( 23,1) USB Gerät 2-2.1 : Microsoft Wireless Optical Mouse .00 (Microsof
   1,5% ( 18,9) <interrupt> : extra timer interrupt
   0,8% ( 10,3) wvdial : schedule_timeout (process_timeout)
   0,8% ( 10,3) opera : schedule_timeout (process_timeout)
   0,8% ( 10,0) <kernel module> : ehci_work (ehci_watchdog)

Seems like it does not help.
Binding Opera and Xorg to the same core helps somehow for the rescheduling, but as Opera spawns own operapluginwrapper processes this is senseless.

Thanks for investigating.