C-states are states when the CPU has reduced or turned off selected functions. Different processors support different numbers of C-states in which various parts of the CPU are turned off. … Processors may have deeper C-states that are not exposed to the operating system.

What is C state mode?

In order to save energy when the CPU is idle, you can command the CPU to enter a low-power mode. … These modes or “C-states” start at C0, which is the normal CPU operating mode (the CPU is 100% activated). The higher the C number is, the deeper into sleep mode the CPU goes.

What is C state control?

C-states control the sleep levels that a core can enter when it is idle. C-states are numbered starting with C0 (the shallowest state where the core is totally awake and executing instructions) and go to C6 (the deepest idle state where a core is powered off).