dynticks not working - 1000 extra timer interrupts/s

[David Rees]

Last night I upgraded a K6-2 machine from FC6 to F7 so that I could
get the latest kernel with dynticks support and hopefully save a
couple watts at idle.

But it appears that dynticks isn't working on this machine as I'm
getting about 1000 extra timer interrupts a second as shown by
powertop.

How can I tell if this is a kernel configuration issue or a limitation
of the hardware? Comparing the config for this kernel
(kernel-2.6.22.1-41.fc7 i586) with the config for the i686 kernel
doesn't show any obvious differences which would cause it.

-Dave