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From Wikipedia, the free encyclopedia
VIA LongHaul is a CPU speed throttling and power saving technology developed by VIA Technologies. By executing specialized instructions, software can exercise fine control on the bus-to-core frequency ratio and CPU core voltage. When the system first boots, the ratio and voltage are set to hardware defaults. While the operating system runs, a CPU driver controls the throttling according to how much load is put on the CPU.
This fine control over the CPU's operating parameters brings LongHaul in contrast to other competing technologies, where a CPU is typically allowed to switch between only two states - one that is fast but power-consuming and one that is slow but uses less power. However LongHaul is considered similar to Transmeta's LongRun technology.
There are 3 versions of LongHaul:
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