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3.10. Power Capping
Dynamic Power Capping is a feature available on select ProLiant and BladeSystem servers that allows system administrators to cap the power consumption of a server or a group of servers. The cap is a definitive limit that the server will not exceed, regardless of its current workload. The cap has no effect until the server reaches its power consumption limit. At that point, a management processor adjusts CPU P-states and clock throttling to limit the power consumed.
/dev/hpilo/dXccbN. The kernel also includes an extension of the
sysfsinterface to support power capping features, and a
hwmondriver for ACPI 4.0 power meters that use the
sysfsinterface. Together, these features allow the operating system and user-space tools to read the value configured for the power cap, together with the current power usage of the system.
Intel Node Manager imposes a power cap on systems, using processor P-states and T-states to limit CPU performance and therefore power consumption. By setting a power management policy, administrators can configure systems to consume less power during times when system loads are low, for example, at night or on weekends.