E-Tech ET8 Dokumentacja Pobierz pdf (Strona 82)

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48 IBM BladeCenter JS23 and JS43 Implementation Guide

power savings mode is enabled, the firmware of the

system continuously monitors the utilization of the

system, and adjusts the CPU clock speed and voltage to

provide enough power to run the current workload. The

less the system is utilized, the more power savings are

achieved. In addition, you can specify whether you want to

favor performance or favor power when enabling dynamic

power savings mode. With favor performance, the peak

frequency of the processors may be greater than 100%.

With favor power, the processors are limited to 95% of

nominal frequency under full utilization.

Power Capping Capping enforces a user-specified limit on power usage.

Power Capping is not a power saving mechanism. It

enforces power caps by actually throttling the processors

in the system, degrading performance significantly. The

idea of a power cap is to set something that should never

be reached but frees up margined power in the data

center. The margined power is the amount of extra power

that is allocated to a server during its installation in a

datacenter. It is based on the server environmental

specifications that usually are never reached because

server specifications are always based on maximum

configurations and worst case scenarios.

Processor Core Nap The IBM POWER6 processor uses a low-power mode

called Nap that stops processor execution when there is

no work to do on that processor core, that is, both threads

are idle. Nap mode allows the hardware to clock off most

of the circuits inside the processor core. Reducing active

power consumption by turning off the clocks allows the

temperature to fall, which further reduces leakage (static)

power of the circuits causing a cumulative effect.

Unlicensed cores are kept in core Nap until they are

licensed and return to core Nap whenever they are

unlicensed again.

For more information regarding the EnergyScale Technology on POWER6

processor-based systems, see:

http://www-03.ibm.com/systems/power/hardware/whitepapers/energyscale.ht

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