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Chapter 9. Power Optimization > Constant versus Dynamic Power

Constant versus Dynamic Power

When the hardware system components can operate in a range of power and performance states, from low-power and low-performance to high-performance and peak power, then the resulting power efficiency of an operational system becomes a consequence of the actions and activity of the operating system and application software. Software engineers would hope that idle software would lead to lower power consumption.

However, all systems have some degree of power consumption that is independent of system use. This constant power is drawn regardless of load.

Constant Power

An embedded computer consumes a constant, minimum amount of power when powered on, regardless of the level of system activity. Unfortunately, it is often the case that this constant power dominates the overall power budget of a system. Other than by powering a system down completely or transitioning to a sleep state, software cannot influence a system’s constant power.


  

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