Messages in this thread | | | From | Andrey Borzenkov <> | Subject | What is "extra timer interrupt" in powertop output? | Date | Sun, 24 Aug 2008 14:26:33 +0400 |
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After disabling CD-ROM polling the next top-100 winner is "extra timer interrupt":
Cn Avg residency P-states (frequencies) C0 (cpu running) ( 4.2%) 750 Mhz 0.0% polling 0.0ms ( 0.0%) 500 Mhz 100.0% C1 0.0ms ( 0.0%) C2 0.9ms (95.8%)
Wakeups-from-idle per second : 1101.2 interval: 5.0s Power usage (ACPI estimate): 11.7W (2.2 hours)
Top causes for wakeups: 31.6% ( 8.4) <interrupt> : extra timer interrupt 15.0% ( 4.0) hald-addon-acpi : schedule_timeout (process_timeout)
I assume, this is what is simply called "timer": {pts/1}:~%> cat /proc/interrupts CPU0 0: 9060975 XT-PIC-XT timer 1: 18742 XT-PIC-XT i8042 2: 0 XT-PIC-XT cascade 3: 2 XT-PIC-XT 4: 2 XT-PIC-XT 5: 3 XT-PIC-XT 7: 5 XT-PIC-XT irda0 8: 11 XT-PIC-XT rtc0 9: 3376 XT-PIC-XT acpi 10: 2 XT-PIC-XT 11: 239251 XT-PIC-XT ohci_hcd:usb1, yenta, yenta, yenta, ALI 5451, pcmcia0.0 12: 621206 XT-PIC-XT i8042 14: 225993 XT-PIC-XT ide0 15: 315463 XT-PIC-XT ide1 NMI: 0 Non-maskable interrupts ERR: 0
Any way to find out why there are so many of them? System is using dynamic ticks: {pts/1}:~/src/linux-git%> grep NO_HZ /boot/config CONFIG_NO_HZ=y
TIA
-andrey
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