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Figure 6-30 Active Energy Manager: Watt-Hour Meter
Management functions
The management functions are Power Saver and Power Capping. They provide
methods to reduce energy consumption by dropping the processor voltage and
frequency. The functions are available for a 90-day trial use. You must purchase a
license and install a key to use these functions beyond the trial period.
Power Saver mode
Power Saver mode provides a way to save power by dropping the voltage and
frequency a fixed percentage. 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. In the Active Energy Manager user interface the
Power Saver mode is set to enable or disable.
One possible use for Power Saver would be to enable it when workloads are
minimal, such as at night, and then disable it in the morning. When Power Saver
is used to reduce the peak energy consumption, it can lower the cost of all power
used. At low processor utilization, the use of Power Saver increases processor
utilization such that the workload notices no performance effect. Depending on
workload, this can reduce the processor power usage by 20-30%.
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Chapter 6. Management
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