nudge from Rumi Szabolcs on port-i386.
The estd daemon dynamically sets the CPU-frequency on
SpeedStep-enabled CPUs depending on current cpu-utilization. It is
written for systems running NetBSD.
Examples:
Maximize battery lifetime by limiting CPU-frequency to 1000 MHz and
switching to lower speeds fast:
estd -d -b -M 1000
Maximize performance by running at least at 1400MHz and switching to
higher speeds real fast:
estd -d -a -m 1400