Power Management
Which describes CPU C-states?
- ACombinations of frequency and voltage while the CPU is running
- BStates representing how deeply an idle CPU sleeps; deeper states use less power but take longer to wake
- CNames of CPU manufacturing steps
Show answer and explanation
Answer: B. States representing how deeply an idle CPU sleeps; deeper states use less power but take longer to wake
Among C-states, C0 is executing instructions, C1 is a shallow sleep that merely stops the clock, and deeper states flush caches and power off the core, stopping more circuitry as the number grows. Deeper states save more power but take longer and cost more to exit, so the OS predicts the time until the next work and chooses an appropriate depth.
- A. That is a P-state.
- B. Correct. C0 is active; larger numbers mean deeper sleep.
- C. It is not a manufacturing step.