[Bug 524281] Re: Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled

[Richard Kleeman]

I tried the rc6-power3 kernel and these are the powertop numbers

Wakeups-from-idle per second : 258.3	interval: 15.0s
no ACPI power usage estimate available
Top causes for wakeups:
  35.2% ( 70.1)   [kernel scheduler] Load balancing tick
  20.7% ( 41.1)   [extra timer interrupt]
   6.5% ( 12.9)   [iwlagn] <interrupt>
   6.0% ( 11.9)   firefox-bin
   5.5% ( 11.0)   nautilus
   5.0% (  9.9)   syndaemon
   4.1% (  8.1)   [kernel core] usb_hcd_poll_rh_status (rh_timer_func)
   2.4% (  4.9)   [kernel core] hrtimer_start (tick_sched_timer)
   2.2% (  4.3)   [TLB shootdowns] <kernel IPI>

So the results are worse than with the rc5-power2 kernel but better than
the original rc5 Brian Rogers kernel in that there are no wakeups from

[kernel core] hrtimer_start (tick_sched_timer)

which amounts to about 40 wakeups.

These changes are clearly influencing this problem but I feel like we
need an expert (kernel dev) to interpret what is going on with the
benchmarks from various code changes.....

-- 
Tens of wakes per second in "[kernel scheduler] Load balancing tick" on Core 2 Duo even with only 1 core enabled
https://bugs.launchpad.net/bugs/524281
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