Dell R210 II Technical Manual

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Contents

Dell R210 II Technical Manual Manual pdf 39 page image

Dell PowerEdge R210 II Technical Guide 399.2.1.2 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 11 summarizes the power management features on this system:Table 11. Power Management FeaturesFeature Type Enable/Status/Ctrl bitlocationDescriptionACPI modeswitchFixed PCH The OS uses the SCI_EN bit to switch from legacy mode toACPI mode.Sleep states Fixed PCH Supported states: S0(Working), S4-OS (‘Hibernation’ in W2K),and S5 (Soft-off).S1 (also called ‘standby’ or ‘suspend’) and S3 are notsupported.Power Button Fixed PCH In ACPI mode, OS has control of the power button. In non-ACPI mode, SMI handler owns power button events.Real-TimeClockFixed PCH The OS is able to configure the system to wake on the RTCalarm.Power Mgmt.TimerFixed PCH 24-bit power management timer is used.Power Mgmt.Event (PME)Generic PCH Each host bus’s PME# signal is routed to a separate general-purpose event pin in the chipset. When a device signals PME#,the system wakes (if necessary), the OS detects the event,and a Dell-defined ASL routine handles the event. Wake-on-LAN is one example of a PME.USB wake Generic N/A This feature is not supported on this system since the S1 stateis not supported.DBS N/A Processor MSRs This feature does P state transition under WindowsC StateSupportN/A Processor andPCH registersThis feature allows multiple C state supports for Processor.This feature will work under Windows and ACPI OS thatunderstand C states.Power ProfilesupportN/A Processor/IMCand PCHchipsetregistersIn addition to P,C and T states, BIOS will expose the PowerProfiles to the OS. Each Power profile will have a specificsettings and it will fine tune processor, MCH, IOH and SouthBridge.