HP Insight Control Power Management 7.3 User

Figure 3 (page 14) shows watts consumed and relative workload at various workloads for each
Power Regulator state. The system used in this test is an HP ProLiant DL380G5 with two Intel Xeon
5080 CPUs.
Figure 3 Power and throughput in each of the HP Power Regulator modes
Analysis of power consumption
In HP Static High Performance Mode, power consumption ranges from 339 W in an idle state to
558 W at 100% utilization. This is an example of power consumption without the benefit of Power
Regulator technology.
The green line shows power consumption in HP Static Low Power Mode ranging from 339 W in
an idle state to 475 W at 80% utilization and to 497 W at 100% utilization.
The blue line shows power consumption in HP Dynamic Power Savings Power Mode ranging from
339 W in an idle state to 475 W at 80% utilization and to 558 W at 100% utilization.
An idle system consumes the same power (339 W) regardless of the Power Regulator mode.
Additionally, the power consumed in HP Dynamic Power Savings Mode matches the power
consumed in HP Static Low Power Mode from idle to 80% utilization because this system is running
in the lower processor p-state from idle to 80% utilization when it is in the Dynamic Mode. In
Dynamic Mode, after 80% utilization, the system shifts into the highest processor p-state and the
power consumption for 90% and 100% workload, and it 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
14 Key concepts