LongRun and LongRun2 are power management technologies introduced by Transmeta.
One control offered processor frequency levels, and the ability to set a minimum and maximum "window", where the automatic controls would not adjust the speed outside of the window.
Some versions offered a third control that adjusted the processor based on power rather than speed.
[2] LongRun was based primarily on reducing the clock frequency and voltage supplied to the processor, now commonly called DVFS.
Lower frequency reduces performance but also allows voltage reduction, and can yield both power savings and improved efficiency.