CPU Idle States #Cstates #WindowsInternals (1/6)
C-states, also known as CPU Idle 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. (2/6)
Generally, higher C-states shut off more parts of the CPU, leading to significantly reduced power consumption.
Processor Power Policy is owned and managed by the Windows Kernel Power Manager. (3/6)
Processor Power Policy is owned and managed by the Windows Kernel Power Manager. (3/6)
The Power Manager is responsible for choosing the correct processor state known as the “Target” state. This Target state is based on CPU usage and other factors, depending on the processor power management technology involved. (4/6)
The “Actual” state displayed on this graph reflects the actual C-state of the CPU at a point in time.
There is a possibility that a CPU manufacturer may choose not to expose all C-states supported by a processor. (5/6)
There is a possibility that a CPU manufacturer may choose not to expose all C-states supported by a processor. (5/6)
Time spent in those unexposed states may have been spent in even deeper C-states than indicated. However, since this information is not made available to Windows, information on unexposed CPU states will not be shown in WPT. (6/6)
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