P-State Management; Efficient Practices For Servers And Enclosures; Understanding Server Power Utilization And Heat Generation - Compaq BL10e - HP ProLiant - 512 MB RAM Introduction Manual

Table2. P-states of the Intel Quad-Core 2.66-GHz processor
P-state Description
Pmax Maximum performance
Pmin Minimum power

P-state management

IT administrators can control processor P-states by one of two basic methods: through the operating
system (OS) with the use of a driver, or more directly through firmware in the BIOS ROM (Figure 2).
Figure 2. Methods for controlling processor P-states
An OS-based control method requires an OS upgrade and driver installation on any server where P-
state management is desired. A ROM-based solution, however, provides P-state control at power-up,
requires no software loading or upgrade, and can operate on systems running an OS that does not
support P-state management. HP Power Regulator for ProLiant servers is an example of OS-
independent, power management. This HP hardware/software implementation enables a system
administrator to manage processor power consumption and system performance in either static or
dynamic modes. Mare information about the Power Regulator for ProLiant servers can be found at
www.hp.com/servers/power-regulator.

Efficient practices for servers and enclosures

The HP product line includes dual-processor and quad-processor server blades that can be installed in
the same rack-mounted enclosure, interconnected, and easily managed. This high-density server
technology lowers the operating cost per processor by reducing management expenses and the
requirements for floor space.

Understanding server power utilization and heat generation

IT equipment manufacturers typically provide power and heat load information in their product
specifications. HP provides a Rack/Site Installation Preparation Utility to assist customers in
approximating the power and heat load per rack for facilities planning. The Site Installation
Preparation Utility uses the power calculators for individual platforms so that customers can calculate
the full environmental effect of racks with varying configurations and loads. This utility can be
downloaded from
http://h30099.www3.hp.com/configurator/calc/Site%20Preparation%20Utility.xls.
Core Frequency
2.66 GHz
2.0 GHz
OS Control Mode OS Control Mode
OS OS
Driver Driver
System ROM System ROM
Hardware Hardware
Registers Registers
Approximate Core
voltage
1.2 VDC
1.0 VDC
HP Dynamic and HP Dynamic and
Static control modes Static control modes
System ROM System ROM
Hardware Hardware
Registers Registers
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