Tuning idle with latency_factor

Translates between latency and power break-even
Enter C-state if (expected duration) < (latency * latency_factor)
Formerly 6, generally deemed not aggressive enough
Currently 2, generally deemed too aggressive
boot time:
grub.conf: "processor.latency_factor=4
run time:
 /sys/module/processor/parameters/latency_factor