40 IBM eX5 Implementation Guide
Figure 2-21 Efficiency Mode predetermined values
Performance Mode
Figure 2-22 shows the Performance Mode predetermined values. The server is set to use the
maximum performance limits within UEFI. These values include turning off several power
management features of the processor to provide the maximum performance from the
processors and memory subsystem. Performance Mode provides the best system
performance at the expense of power efficiency.
Figure 2-22 Performance Mode predetermined values
Performance Mode is also a good choice when the server runs virtualization workloads.
Servers that are used as physical hosts in virtualization clusters often have similar power
consumption management at the operating system level. In this environment, the operating
system makes decisions about moving and balancing virtual servers across an array of
physical host servers. Each virtualized guest operating system reports to a single cluster
controller about the resources usage and demand on that physical server. The cluster
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