View Full Version : [ubuntu] rescheduling interrupts

August 16th, 2008, 12:33 AM
powertop is reporting approximately 1000 wake ups from

<kernel IPI> : Rescheduling interrupts

booting with the option acpi=noirq cuts them to approximately 500 and saves approximately 3W (-20%), however it breaks sound. I didn't have so many wake ups until recently.

June 20th, 2009, 04:18 PM
sorry about resurrecting a dead thread but no point in making a completly new one.

I'm having the same problem (although nits more around 500-700) and I have noticed that it only occurs on a resume from hibernate if I shutdown and reboot completely powertop shows about 10 wakeups per second from <kernel IPI> : Rescheduling interrupts. And the power consumption is also down by about 3W (same as OP), to usually about 7.1w

Cn Avg residency P-states (frequencies)
C0 (cpu running) (55.9%) 1.60 Ghz 23.7%
C0 0.0ms ( 0.0%) 1333 Mhz 22.2%
C1 mwait 0.0ms ( 0.0%) 1067 Mhz 5.1%
C2 mwait 0.3ms ( 1.4%) 800 Mhz 49.0%
C4 mwait 1.1ms (42.7%)

Wakeups-from-idle per second : 422.9 interval: 10.0s
Power usage (ACPI estimate): 10.7W (3.9 hours)

Top causes for wakeups:
81.6% (574.5) <kernel IPI> : Rescheduling interrupts
7.4% ( 52.1) <interrupt> : extra timer interrupt
4.1% ( 28.8) firefox : futex_wait (hrtimer_wakeup)
2.8% ( 19.6) <interrupt> : uhci_hcd:usb3, ath
2.7% ( 19.3) firefox : schedule_hrtimeout_range (hrtimer_wakeup)

I'm using a Asus EeePC 1000HE with Ubuntu Netbook Remix (jaunty)

UPDATE: Seems this is also happening now after a reboot. After a bit more digging it at first looked like firefox was the problem but then I figured it was not firefox itself but sites with embedded youtube videos caused this problem, It't not a big problem with a site with one video but I was on a site with many (Andrew Sullivan is covering the Iran situation and is throwing up a lot of videos posted on youtube from Iran).

I'll do some further checking to see if it is firefox drawing a lot of resources for things like youtube.

June 20th, 2009, 07:46 PM
You revived the wrong thread actually, for two reasons: my original post is a couple of releases old, and this is a subforum for system76 computers. You should repost it in the general help forum.