System Profile Settings
Use this window to control the power management settings.
NOTE: The help page may include information about features and values that are not supported on your system. Server Administrator displays only the features and values that are supported on your system.
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User Privileges
Selection | View | Manage |
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System Profile Settings | Administrator, Elevated Administrator (Linux only) | Administrator, Elevated Administrator (Linux only) |
NOTE: For more details on user privilege levels, see
Privilege Levels in the Server Administrator GUI.
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NOTE: Based on the available hardware, dependencies may exist between the various attributes for settings. For example, setting an attribute value may change the state of the dependent attributes to noneditable or editable, as the case may be. For example, changing the
System Profile setting to
Custom allows you to configure all the other related settings in that page.
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System Profile
Sets the System Profile to Performance Per Watt (DAPC), Performance Per Watt (OS), Performance, Workstation Performance, or Custom mode. When the option is set to a mode other than Custom, BIOS sets each option accordingly. When the option is set to Custom, you can change setting of each option. Under Custom mode when C state is enabled, Monitor/Mwait should also be enabled.
CPU Power Management
Allows selection of CPU power management methodology.
System Demand-based Power Management (DBPM) | Utilizes a BIOS-controlled dynamic frequency manipulation scheme to save power across various utilization levels as part of the Dell Advanced Power Control (DAPC) capability. The power-saving features of this option typically are greatest at mid-to-lower processor utilization levels. |
Maximum Performance | Selected for performance-centric workloads where it is acceptable to consume additional power to achieve the highest possible performance for the computing environment. This mode drives processor frequency to the maximum across all cores (although idled cores can still be frequency that is reduced by C-state enforcement through BIOS or operating system mechanisms if enabled). This mode also offers the lowest latency of the CPU Power Management Mode options, so it is always preferred for latency-sensitive environments. |
OS DBPM | OS DBPM is another performance-per-watt option that relies on the operating system to dynamically control individual core frequency. Both Windows and Linux can take advantage of this mode to reduce frequency of idled or underutilized cores to save power. This feature is read-only, unless the System Profile is set to Custom. |
Memory Frequency
Controls the BIOS memory frequency. The variables that govern maximum memory frequency include the maximum rated frequency of the DIMMs, the DIMMs per channel population, the processor choice, and this BIOS option. Additional power savings can be achieved by reducing the memory frequency, at the expense of reduced performance. This feature is read-only, unless the System Profile is set to Custom.
Turbo Boost
Governs the Boost Technology. This feature allows the processor cores to be automatically clocked up in frequency beyond the advertised processor speed. The amount of increased frequency (or turbo upside) is expected from a Xeon processor depending on the processor model, thermal limitations of the operating environment, and sometimes power consumption. In general terms, when the cores being exercised with work is fewer, the potential turbo upside is higher. The potential drawbacks for Boost are centered on increased power consumption and possible frequency jitter than can affect a small minority of latency-sensitive environments. This feature is read-only, unless the System Profile is set to Custom. When set to Enabled, the processor can operate in Turbo Boost Mode .
C1E
Enabled | The processor is allowed to switch to minimum performance state when idle. This feature is read-only, unless the System Profile is set to Custom. |
Disabled | The system disables the turbo mode capability of the processor. |
C States
C States allow the processor to enter lower power states when idle. When the option is set to Enabled (operating system controlled) or when set to Autonomous (if hardware controlled is supported), the processor can operate in all available Power States to save power, but may increase memory latency and frequency jitter. This feature is read-only, unless the System Profile is set to Custom.
Write Data CRC
When set to Enabled, DDR4 data bus issues are detected and corrected during 'write' operations. Two extra cycles are required for CRC bit generation which impacts the performance. Read-only unless System Profile is set to Custom.
Disabled | When the option is set to Disabled, no patrol scrubbing occurs. |
Standard | When the option is set to Standard Mode, the entire memory array is scrubbed once in a 24-hour period. |
Extended | When the option is set to Extended Mode, the entire memory array is scrubbed more frequently to further increase system reliability. |
Memory Patrol Scrub
Patrol Scrubbing searches the memory for errors and repairs correctable errors to prevent the accumulation of memory errors. This feature is read-only, unless the System Profile is set to Custom.
Disabled | When the option is set to Disabled, no patrol scrubbing occurs. |
Standard | When the option is set to Standard Mode, the entire memory array is scrubbed once in a 24-hour period. |
Extended | When the option is set to Extended Mode, the entire memory array is scrubbed more frequently to further increase system reliability. |
Memory Refresh Rate
The memory controller periodically refreshes the data in memory. The frequency at which memory is normally refreshed is referred to as 1X refresh rate. When memory modules are operating at a higher than normal temperature or to further increase system reliability, the refresh rate can be set to 2X, but may have a negative impact on memory subsystem performance sometimes. This feature is read-only, unless the System Profile is set to Custom.
Uncore Frequency
Selects the Processor Uncore Frequency.
Dynamic mode | Dynamic mode allows processor to optimize power resources across the cores and uncore during runtime. The optimization of the uncore frequency to either save power or optimize performance is influenced by the setting of the Energy Efficiency Policy. This feature is in read-only, unless the System Profile is set to Custom. |
Energy Efficient Policy
The CPU uses the setting to manipulate the internal behavior of the processor and determines whether targeting higher performance or better power savings. This feature is in read-only, unless the System Profile is set to Custom.
Monitor/Mwait
Specifies if the Monitor/Mwait instructions are enabled. Monitor/Mwait can be disabled only when C State is Disabled in Custom mode. When C State is Enabled in Custom mode, changing the Monitor/Mwait settings does not affect the system power or performance.
Workload Profile
Allows you to optimize the performance based on the workload. The Workload Profile setting is not a state. Setting a workload profile is a one-time action that in turns modifies various BIOS settings to be optimized for the requested workload type.
CPU Interconnect Bus Link Power Management
When the option is set to Enabled, CPU interconnect bus link power management is enabled.
PCI ASPM L1 Link Power Management
When the option is set to Enabled, PCIe Advanced State Power Management (ASPM) can reduce overall system power a bit while slightly reducing system performance.
NOTE: When ASPM is
Enabled, some devices may not perform properly—they may stop responding or cause the system to stop responding. For this reason, L1 is only enabled for validated qualified cards.
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OS ACPI Cx
Sets the OS ACPI Cx to C2 or C3 state.
GPSS Timer
Controls the reduction of GPSS timer to be set from 0-500us (typical=500us).
CPU C1 Auto Demotion
When the option is set to Enabled, allows the CPU core to automatically demote to lower core idle states.
CPU C1 Auto UnDemotion
When the option is set to Enabled, allows the CPU to automatically undemote from demoted C1 state.
Workload Configuration
Controls the energy performance BIAS settings to allow BIOS to choose a configuration that improves performance on certain workload.
Dynamic L1
Only applies to the package level setting to allow dynamic entering lower power link state L1.
Package C States
Enables the package to transition to deeper C-state or limit to operational state.
Package C State Latency Negotiation
Only applies to package C state latency negotiation when package C state is Enabled.
Power and System Criteria for Package C State
Enables power and system criteria for Package c state.
Power Saver
Enables or Disables the Power Saver DAPC algorithm.
Memory Operating Voltage
Sets the DIMM voltage selection.
Auto (default) | The system automatically sets the system Voltage to the optimal setting based on the DIMM capability and the installed DIMM population. |
1.5 V | Enables setting the system DIMM voltage to a higher (1.5 V) setting if the DIMMs support multiple voltages and have been Auto set to a lower voltage. |
Collaborative CPU Performance Control
When set to Enabled, the CPU power management controls the OS DBPM and the System DBPM (DAPC). This feature can be enabled only when CPU Power Management is set to System DBPM (DAPC) in Custom mode. Else, changing this setting does not affect the system power or performance.
Energy Efficient Turbo
Sets the Energy Efficient Turbo as enabled or disabled.
Energy Efficient Policy
Sets the Energy Efficient Policy as Performance, Balanced Performance, Balanced Energy, and Energy Efficient.
Number of Turbo Boost Enabled Cores for Processor N
Sets the number of Turbo Boosts enabled cores for the processor. By default, the maximum number of cores per processor is enabled.