same here: Dell D630 Core2 Duo 2 GHz with hardy alpha 6 and kernel 
2.6.24-12.20-i386

Wakeups-from-idle per second : 5426,0   interval: 3,0s
Power usage (5 minute ACPI estimate) :   0,0 W (1602,1 hours left)

Top causes for wakeups:
  33,9% (155,3)      <kernel IPI> : Rescheduling interrupts 
  14,1% ( 64,7)       <interrupt> : extra timer interrupt 
  13,6% ( 62,3)       <interrupt> : [EMAIL PROTECTED]:0000:00:02.0 
   8,7% ( 39,7)   USB device  3-1 : USB-PS/2 Optical Mouse (Logitech) 
   8,6% ( 39,3)       <interrupt> : uhci_hcd:usb1, uhci_hcd:usb3, ehci_hcd:usb7 
   4,3% ( 19,7)       <interrupt> : iwl3945 
   2,6% ( 12,0)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func) 
   2,5% ( 11,3)     geyes_applet2 : schedule_timeout (process_timeout) 
   2,2% ( 10,0)   cpufreq-selecto : cpufreq_governor_dbs 
(delayed_work_timer_fn) 


turning off one core with 

   echo 0 > /sys/devices/system/cpu/cpu1/online

completely changes the things:


Wakeups-from-idle per second : 192,3    interval: 3,0s
Power usage (5 minute ACPI estimate) :   0,0 W (1969,8 hours left)

Top causes for wakeups:
  25,6% ( 93,0)       <interrupt> : [EMAIL PROTECTED]:0000:00:02.0 
  22,8% ( 83,0)   USB device  3-1 : USB-PS/2 Optical Mouse (Logitech) 
  22,7% ( 82,3)       <interrupt> : uhci_hcd:usb1, uhci_hcd:usb3, ehci_hcd:usb7 
   5,4% ( 19,7)       <interrupt> : iwl3945 
   5,3% ( 19,3)       compiz.real : schedule_timeout (process_timeout) 
   3,3% ( 12,0)   <kernel module> : usb_hcd_poll_rh_status (rh_timer_func) 
   2,9% ( 10,7)     geyes_applet2 : schedule_timeout (process_timeout) 
   2,8% ( 10,0)   cpufreq-selecto : cpufreq_governor_dbs 
(delayed_work_timer_fn) 

that's an extreme difference!

-- 
Kernel 2.6.24-2 causing ~1000 wakeups by "Rescheduling Interrupts"
https://bugs.launchpad.net/bugs/177895
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