Dell PowerEdge R210 II Technical Manual

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Dell33PowerEdge R210 II Technical Guide9.2 Supported ACPI States● ACPI compliance: S0, S4, S5 supported● No S1, S2, S3 (STR) support● S4 supported by OS onlyTable 11. Supported ACPI StatesEvents (Wake Up) S0System ON S1 S2/S3S4Hibernate (OSsupported)S5SoftOffPower Button  — —  RTC alarm — — —  —WOL — — —  —iDRAC  — —  9.2.1 Power Management ModesThe R210 II uses operating system-based power management.9.2.1.1 Power Saving BIOS Setting (OS Control)Intel processors support Demand Based Switching (DBS) which enables the processor to dynamicallychange its operating frequency in response to workload changes. The industry standardimplementation of this power management feature is in the Operating System (OS). The OS monitorsprocess and thread level utilization of the processor and uses processor controls to change theprocessor‘s operating frequency. For heavy workloads, the OS runs the processor at higherfrequencies for additional performance. Lighter workloads do not need high performance, thus theOS runs the processor at lower frequencies.9.2.1.2 Maximum PerformanceThe Maximum Performance Mode disables power management. In this mode, the processor frequencyis statically set to the highest supported frequency.The power management features are implemented through two categories: fixed or generic. Fixedfeatures use bits defined in the ACPI specification for specific capabilities. The fixed feature bitsgive the OS complete control over the power management of a device since the location of the bits isgiven to the OS in the FACP table. Thus, a driver can directly access bits to control a device‘s powermanagement. Generic features have defined enable and status bits, but the functionality is not fullyvisible to the OS. Dell provides ASL code to handle the details of generic features, allowing the OS tointelligently communicate with system-specific hardware.Table 12 summarizes the power management features on this system: