Some operating system software might defeat the ACPI mapping (for example, intel_idle driver). Enabled: When “Enabled” is selected, the operating system initiates the C-state transitions.C-States-C-states reduce CPU idle power.Custom-Custom mode allows the user to individually modify any of the low-level settings that are preset and unchangeable in any of the other four preset modes.Efficiency of the system might go down in this mode, but the absolute performance might increase depending on the workload that is running. Things like fan speed and heat output of the system, in addition to power consumption, might increase. In this mode, power consumption is not considered. Performance-This mode maximizes the absolute performance of the system without regard for power.In this mode, no bus speeds are derated as they are in the Performance Per Watt DAPC mode, leaving the operating system in control of those changes. Note that this mode is slightly different than "Performance Per Watt DAPC" mode. Performance Per Watt OS-This mode optimizes the performance/watt efficiency with a bias towards performance."Efficiency–Favor Power" mode maintains backwards compatibility with systems that included the preset operating modes before Energy Star for servers was released. It is expected that this will be the favored mode for SPECpower testing. It provides the best features for reducing power and increasing performance in applications where maximum bus speeds are not critical. Performance Per Watt DAPC (Dell Advanced Power Control)-This mode uses Dell presets to maximize the performance/watt efficiency with a bias towards power savings.Because of this, a menu option is provided that can help a customer optimize the system for things such as minimum power usage/acoustic levels, maximum efficiency, Energy Star optimization, or maximum performance. System Profile: (Default=Performance Per Watt)-It can be difficult to set each individual power/performance feature for a specific environment.All Power Capping should be removed in performance-sensitive environments.Thermally challenged environments should increase fan speed through iDRAC Thermal section.Will reduce CPU core count and give higher Base and Turbo frequencies. Depends on if your program is affected by Base and Turbo frequency. Option is available on liquid cooled systems only. Dell Controlled Turbo helps to keep core frequency at the maximum all-cores Turbo frequency, which reduces jitter. This only benefits SPEC FP_rate if the thread count scales to the total logical processor count. Logical Processor (Hyper Threading) tends to benefit throughput-oriented workloads such as SPEC CPU2017 INT and FP_RATE. Only available when x4 DIMMS installed in the system. Use Optimizer Mode when Memory Bandwidth Sensitive, up to 33% BW reduction with Fault Resilient Mode. BIOS setting recommendations-Memory, processor, and iDRAC settings Autonomous on Air Cooled system or Disabled on Liquid Cooled Systems Dynamic selection can provide more TDP headroom at the expense of dynamic uncore frequency. You can test your own environment to determine whether disabling Memory Patrol Scrub is helpful. This will prevent the Linux intel_idle driver from enforcing C-states. Monitor/Mwait should only be disabled in parallel with disabling Logical Processor. Evaluate Turbo Boost Technology in your own environment to choose which setting is most appropriate for your workload, and consider the Dell Controlled Turbo option in parallel. SST Turbo Boost Technology is substantially better than previous generations for latency-sensitive environments, but specific Turbo residency cannot be guaranteed under all workload conditions. Select Performance Profile first, and then select Custom to load optimal profile defaults for further modification Other System Profile defaults are driven by this choice and may be different than the examples listed. Recommended for general business/scientific throughput (for example, SPECcpu2017)įirst select Performance Optimized and then select Custom ĬPU Interconnect Bus Link Power Management Recommended setting for low latency, Stream, and MLC environments Recommended setting for performance for HPC and SPECcpu speed environments
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