Chapter 3. Technical description of the hardware architecture 47
existing integer and floating-point units and enables highly parallel operations, up
to 16 operations in a single clock cycle. By leveraging AltiVec technology,
developers can optimize applications to deliver acceleration in
performance-driven, high-bandwidth computing.
The AltiVec technology is not comparable to the IBM POWER6 processor
implementation, which uses the Simultaneous Multithreading functionality.
3.4 IBM EnergyScale technology
IBM EnergyScale technology is featured on the IBM POWER6 processor-based
systems. It provides functions to help you understand and control IBM server
power and cooling usage.
In this section we describe IBM EnergyScale features and hardware and
software requirements.
Power Trending EnergyScale provides continuous power usage data
collection. This provides the administrators with the
information to predict power consumption across their
infrastructure and to react to business and processing
needs. For example, an administrator could adjust server
consumption to reduce electrical costs. To collect power
data for the IBM BladeCenter JS23 Express you do not
need any additional hardware because it collects the
information internally.
Power Saver Mode Power Saver Mode can be static or dynamic. Static Power
Saver Mode lowers the processor frequency and voltage
on a system a fixed amount, reducing the power
consumption of the system while still delivering
predictable performance. This percentage is
predetermined to be within a safe operating limit and is
not user configurable. Under current implementation this
is a 14% frequency drop. When CPU utilization is low,
Power Saver Mode has no impact on performance. Power
Saver Mode can reduce the processor usage up to 30%.
Power Saver Mode is not supported during boot or reboot
although it is a persistent condition that will be sustained
after the boot when the system starts executing
instructions.
Dynamic Power Saver Mode, on the other hand, varies
processor frequency and voltage based on the utilization
of the system's POWER6 processors. When dynamic
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