HP Insight Control Power Management 7.3 User

frequency. The CPU is set to the maximum performance p-state if the CPU utilization requires
the fastest CPU frequency.
The point at which Power Regulator shifts from the minimum p-state to the maximum p-state
varies based on the processor installed in the system. A 3.773 GHz CPU that has a 3.0 GHz
minimum p-state frequency switches modes at around 75% utilization. A 3.2 GHz CPU that
has a 3.0 GHz minimum p-state frequency switches modes at around 88% utilization.
• OS Control Mode—Power Regulator configures the system to enable the operating system to
control the p-states. Moving from this state to any of the three previous states requires a system
reboot.
NOTE: On ProLiant G5 systems equipped with AMD processors, setting Power Regulator for
ProLiant to HP Static Low Power mode will defeat any power cap setting. HP recommends that
Power Regulator for ProLiant be set to HP Dynamic Power Savings mode.
HP Power Regulator modes such as Static Low Power Mode, Static High Performance Mode, and
Dynamic Power Savings Mode work for any operating system. The OS Control Mode requires
Microsoft Windows Server 2003 SP1 or later or Red Hat Linux 4 Update 2 or later.
For more information on supported processors, see http://www.hp.com/servers/power-regulator.
HP Power Regulator for Integrity
Although power monitoring operates independently of the operating system, HP Power Regulator
for Integrity requires a compliant operating system version. Consult operating system documentation
for details on power management support for your system. Power regulation also requires p-state
capable hardware.
Power Regulator for Integrity operates in the following modes:
• HP Static Low Power Mode—Power Regulator for Integrity sets the processors to the
power-performance state (p-state) with the lowest power consumption and forces them to stay
in that state. This mode saves the maximum amount of resources, but it might affect the system
performance if processor utilization stays at or above 75% utilization.
• HP Static High Performance Mode—Power Regulator for Integrity sets the processors to the
p-state with the highest performance and forces them to stay in that state. This mode ensures
maximum performance, but it does not save any resources. This mode is useful for creating a
baseline of power consumption data without Power Regulator for Integrity.
• 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
specific to the operating system, so consult your operating system documentation for details.
• 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 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.
Power Regulator 13