The PM features are as follows:
CPU core auto-disabling. When the elastic or performance policy is in effect, the Logical Domains Manager automatically disables a CPU core when all the hardware threads (strands) on that core are not bound to a domain. This feature is available only for the UltraSPARC T2, UltraSPARC T2 Plus, SPARC T3, and SPARC T4 platforms.
CPU clock cycle skip.When the elastic policy is in effect, the Logical Domains Manager automatically adjusts the number of clock cycles that execute instructions on the following CPU resources that are bound to domains:
Processors (SPARC T3 or SPARC T4 on domains that run the Oracle Solaris 10 or Oracle Solaris 11 OS)
Cores (SPARC M5 only on domains that run the Oracle Solaris 10 OS)
Core-pairs (SPARC T5 or SPARC M6 only on domains that run the Oracle Solaris 10 OS)
The Logical Domains Manager also applies cycle skipping if the processor, core, or core-pair has no bound strands.
CPU dynamic voltage and frequency scaling (DVFS). When the elastic policy is in effect, the Logical Domains Manager automatically adjusts the clock frequency of processors that are bound to domains running the Oracle Solaris 10 OS. The Logical Domains Manager also reduces the clock frequency on SPARC T5, SPARC M5, and SPARC M6 processors that have no bound strands. This feature is available only on SPARC T5, SPARC M5 and SPARC M6 systems.
Coherency link scaling. When the elastic policy is in effect, the Logical Domains Manager causes the hypervisor to automatically adjust the number of coherency links that are in use. This feature is only available on SPARC T5-2 systems.
Power limit. You can set a power limit on SPARC T3, SPARC T4, SPARC T5, SPARC M5, and SPARC M6 platforms to restrict the power draw of a system. If the power draw is greater than the power limit, PM uses techniques to reduce power. You can use the ILOM service processor (SP) to set the power limit.
See the following documents:
Oracle Integrated Lights Out Manager (ILOM) 3.0 CLI Procedures Guide
Oracle Integrated Lights Out Manager (ILOM) 3.0 Feature Updates and Release Notes
You can use the ILOM interface to set a power limit, grace period, and violation action. If the power limit is exceeded for more than the grace period, the violation action is performed.
If the current power draw exceeds the power limit, an attempt is made to reduce the power state of CPUs. If the power draw drops below the power limit, the power state of those resources is permitted to increase. If the system has the elastic policy in effect, an increase in the power state of resources is driven by the utilization level.
Solaris Power Aware Dispatcher (PAD). A guest domain that runs the Oracle Solaris 11.1 OS uses the power-aware dispatcher (PAD) on SPARC T5, SPARC M5, and SPARC M6 systems to minimize power consumption from idle or under-utilized resources. PAD, instead of the Logical Domains Manager, adjusts the CPU clock cycle skip level and DVFS level.
For instructions on configuring the power policy by using the ILOM 3.0 firmware CLI, see “Monitoring Power Consumption” in the Oracle Integrated Lights Out Manager (ILOM) 3.0 CLI Procedures Guide.