Power saving strategies

 Power saving strategies may or may not save power if its usage is not engineered. Turning off a circuit trade off performance vs power consumption. However, other circuit waiting for the resumption of the part may wasted power during the waking up and overall power consumption reduction may be voided or even negated in some circumstances. 

Race to idle strategy is to operate the server at its peak performance at all time and jump into power saving mode when the work is cleared. This strategy usually not taken because of its impact to performance to long start up time from a deep state and also the power costumed in idle state to make it effective.   

Slow and steady strategy operate the server at level to process work continuously hourly without enter into power saving state. This is the most common strategy for server. 

Jog to idle strategy processes work at an optimal frequency and hip into power saving mode during work gap. The issue associate with this strategy is that the gap could be difficult to come by and few depending on the workload.