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Date: Sat, 18 Oct 2003 13:02:29 -0700 (PDT)
From: Nate Lawson <nate@root.org>
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Subject: Variable timer tick rate?
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This is an interesting approach.  If there are no upcoming timeouts,
decrease the tick rate.  Of course, you have to amortize the cost of
resetting the timer over the period of no ticks.

http://kerneltrap.org/node/view/1006

-Nate