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(Thermal Monitor). This driver will throttle the CPU clock modulation, saving some power, also known as ODMC (On Demand Modulation Clock). The processor can change from 12.5% to 100% (there are two erratas, so two levels might be skipped in the worst case). If supported, you'll see the following sysctl sub-tree: machdep.p4tcc.throttling.target: CPU Clock throttling state (0 = lowest, 7 highest) machdep.p4tcc.throttling.current: current CPU throttling state machdep.p4tcc.throttling.available: list of CPU Clock throttling states machdep.p4tcc.throttling.target = 2 machdep.p4tcc.throttling.current = 2 machdep.p4tcc.throttling.available = 7 6 5 4 3 2 Adapted from OpenBSD/FreeBSD.