linux-kernel - Higher wake-up rate when running on battery

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Date:	Wed, 27 May 2009 09:01:04 +0000 (UTC)
From:	Alessandro Guido <alessandro.guido@...il.com>
To:	linux-kernel@...r.kernel.org
Subject:  Higher wake-up rate when running on battery

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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