Chapter 5. Preparing the hardware 145
5.2.1 Operating modes
IBM X6 servers are designed to provide optimal performance with reasonable power
consumption, which depends on the operating frequency and voltage of the processors and
memory subsystem. The operating frequency and voltage of the processors and memory
subsystem affect the system fan speed that adjusts to the current cooling requirement of the
server.
In most operating conditions, the default settings are ideal to provide the best performance
possible without wasting energy during off-peak usage. However, for certain workloads, it
might be appropriate to change these settings to meet specific power to performance
requirements.
The UEFI provides several predefined setups for commonly desired operation conditions.
These predefined values are referred to as
operating modes. Access the menu in UEFI by
selecting System Settings Operating Modes Choose Operating Mode. You can see
the five operating modes from which to choose, as shown in Figure 5-14. When a mode is
chosen, the affected settings change to the appropriate predetermined values.
Figure 5-14 Choose Operating Mode in UEFI System Settings
QPI Link speed Maximum
performance
Maximum
performance
Maximum
performance
Power
efficiency
Maximum
performance
Memory speed Maximum
performance
Maximum
performance
Maximum
performance
Maximum
performance
Maximum
performance
Patrol scrub Disabled Disabled Disabled Disabled Disabled
a. These Virtualization settings are advised for a stand-alone host only. For multiple virtualized hosts in clustered
workloads, use the Maximum performance settings instead.
b. Depending on the processor workload, enabling TurboMode might also increase power consumption. The actual
processing performance boost that you get from TurboMode depends on the environment that the server is in
terms of temperature and humidity, because the processor will only boost performance up to the environmental
limits set by the processor.
Setting Maximum
performance
Virtualization
a
Low latency Performance
per watt
HPC
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