Higher wake-up rate when running on battery
From: Alessandro Guido
Date: Wed May 27 2009 - 05:05:19 EST
I can observe a strange behaviour wrt timer wake-ups when looking at powertop:
- when running on AC, about 8 wake-ups per second.
- when running on battery, the number of wake-ups grows to about 11 and the
main wake-up producers are:
23.1% ( 3.9) <kernel core> : hrtimer_start_range_ns (tick_sched_timer)
19.2% ( 3.2) <interrupt> : acpi
[ These wake-up rates refer to X running KDE4, wi-fi off (by physical switch)
and no usb device connected. ]
Is this a normal behaviour?
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