![]() ![]() ![]() The definition for ‘powersave’ and ‘performance’ scaling governors are: By default, most Linux distributions place the system into a ‘powersave’ mode. For benchmarking, we usually want maximum performance and power. ![]() The Linux kernel supports CPU performance scaling by means of the CPUFreq (CPU Frequency scaling) subsystem that consists of three layers of code: the core, scaling governors and scaling drivers. Therefore there is a natural trade-off between the CPU capacity (the number of instructions that can be executed over a unit of time) and the power drawn by the CPU. As a rule, the higher the clock frequency and the higher the voltage, the more instructions can be retired by the CPU over a unit of time, but also the higher the clock frequency and the higher the voltage, the more energy is consumed over a unit of time (or the more power is drawn) by the CPU in the given P-state. The majority of modern processors are capable of operating in a number of different clock frequency and voltage configurations, often referred to as Operating Performance Points or P-states (in ACPI terminology). ![]()
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