HP Insight Control Software for Linux - Manual (Page 18)

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HP Dynamic Power Savings Mode. Allows the system to dynamically change processor p-states when
needed based on current operating conditions. The implementation of this mode is operating system
specific, so consult your operating system documentation for details.
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OS Control Mode. Power Regulator for Integrity configures the system to enable the operating system
to control the processor p-states. Use this setting to put your operating system (including OS-hosted
applications) in charge of power management. Moving to or from this state does not require a reboot
of Integrity servers.
The HP Power Regulator for Integrity modes are available on supported platforms equipped with Dual-Core
Intel Itanium Processor 9100 series 1.6 GHz dual-core parts.
Understanding HP Power Regulator savings
Server power consumption savings from HP Power Regulator
The resources saved by HP Power Regulator vary significantly from system to system, based on each system
configuration and utilization.
At higher utilization, Power Regulator saves more power. When the OS is idle, modern Intel and AMD
processors are put into a halt state that consumes minimal power.
The following figure 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.
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 at idle 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,
18 Key concepts