HP Insight Control Software for Linux - Manual (Page 19)

the system shifts into the highest processor p-state and the power consumption for 90% and 100% workload,
and matches the power consumption in HP Static High Performance Mode.
The line graphs show that the power saved by HP Dynamic Power Savings Mode increases as the workload
approaches 80% utilization. If the system is configured for HP Static Low Power Mode, it continues to save
increasing amounts of power up to 100% utilization.
The wider the gap between the red line and the blue or green line, the more power is saved.
Analysis of throughput
In the above figure, 1.00 throughput represents the maximum work that can be accomplished by a system
regardless of the Power Regulator mode. All other throughputs are relative to this 1.00 value.
The red bar shows the normalized throughput (or work accomplished) in HP Static High Performance Mode.
In this mode, the relative throughput ranges from no throughput in an idle state up to 1.00 at 100% utilization.
This is an example of the relative throughput without Power Regulator technology.
The green bar shows the normalized throughput in HP Static Low Power Mode. In this mode, the throughput
ranges from no throughput in an idle state to 0.79 at 80% utilization, and to 0.93 at 100% utilization.
The blue bar shows the normalized throughput in HP Dynamic Power Savings Mode. In this mode, the
throughput ranges from no throughput in an idle state to 0.79 at 80% utilization, and to 1.00 at 100%
utilization.
The normalized throughput for all three Power Regulator modes is identical up to an 80% workload. This
indicates that the workload can be completed at either the higher processor p-state (HP Static High Performance
Mode) or the lower processor p-state (HP Static Low Power Mode/HP Dynamic Power Savings Mode). At a
90% to 100% workload, the HP Static Low Power Mode has insufficient CPU cycles at the lower processor
p-state to complete the workload that can be accomplished at the higher p-state.
Conclusion
The previous figure illustrates:
1. HP Static Low Power Mode and HP Dynamic Power Savings Mode save resources when compared to
no power management or HP Static High Performance Mode.
2. HP Static Low Power Mode saves the most resources at full utilization, but still can have some impact
on system performance at the highest levels of utilization.
3. HP Dynamic Power Savings Mode saves the most resources at the workload level just before it switches
to the higher processor p-state.
4. HP Dynamic Power Savings Mode delivers exactly the same level of performance as no power
management or HP Static High Performance Mode.
5. Power Regulator technology saves resources on systems that are busy rather than those that are idle.
Reducing cooling power with HP Power Regulator
Power consumed by the system becomes heat that must be extracted by the data center. The previous figure
illustrates that each watt consumed by the system requires another 1.0 to 1.5 watts for the environmental
control system to cool the system. Correspondingly, reducing power consumption by the system reduces the
air conditioning requirements for the system.
Insight Control power management Power Consumption and CPU Performance graphs estimate the cooling
costs saved.
Avoiding data center expansion
Data center expansion/construction costs an average of $22,000 per square foot. Insight Control power
management can help you determine if your existing data center can support additional systems. Using
Reducing cooling power with HP Power Regulator 19