Processors

Description

Display summary of the installed processors.

[Enabled] can boost the overall CPU performance when all CPU cores are not being fully utilized. A CPU core can run above its rated frequency for a short period of time when it is in turbo mode.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

Enabled is the default setting.

Control the CPU P-states (performance states).

[None]: All P-states are disabled and the CPUs run at either their rated frequency or in turbo mode (if turbo mode is enabled).

[Legacy]: CPU P-states will be presented to the OS. The OS power management (OSPM) controls which P-state is selected.

[Autonomous]: The P-states are fully controlled by system hardware. No P-state support is required in the OS or VM.

[Cooperative] is a combination of [Legacy] and [Autonomous]. The P-states are still controlled by hardware but the OS can provide hints to the hardware for P-state limits, indicating the desired setting.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

Autonomous is the default setting.

C-states reduce CPU idle power.

[Legacy]: The OS initiates the C-state transitions. ACPI C1/C2/C3 map to Intel C1/C3/C6.

[Autonomous]: HALT and C1 request get converted to C6 requests in hardware.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

Autonomous is the default setting.

[Enabled]: Save power by halting idle CPU cores. To use this feature, an OS that supports C1E state must be installed. Setting change takes effect after the next reboot.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose [Custom Mode] in "Choose Operating Mode" and [Legacy]/[Disabled] in "C-States" under the "System Setting" submenu.

Enabled is the default setting.

Enable/Disable Hyper Threading, which is a software method to enable/disable Logical Processor threads.

Enabled is the default setting.

Enable/Disable the Intel Trusted Execution Technology (Intel TXT). Disabled is the default setting.

Enable/Disable the Intel Virtualization Technology. Enabled is the default setting.

Lightly threaded applications and some benchmarks can benefit from having the hardware prefetcher enabled. Enabled is the default setting.

[Enabled] can benefit lightly threaded applications and some benchmarks. Enabled is the default setting.

[Enabled] can benefit lightly threaded applications and some benchmarks. Enabled is the default setting.

This item is typically best left enabled for most environments. Enabled is the default setting.

When enabled, DCA capable I/O devices such as network controllers can place data directly into the CPU cache, shortening response time. Enabled is the default setting.

When enabled, the CPU optimal turbo frequency will be tuned dynamically based on CPU utilization. This item is also influenced by "Power/Performance Bias".

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" and [Enabled] in "Turbo Mode" located under "System Setting" submenu.

Enabled is the default setting.

When [Enabled], the CPU uncore (all miscellaneous logic inside the CPU package) will dynamically change the speed based on the workload. Enabled is the default setting.

Disabling one of the CPU UPI links can save power. To achieve the maximum performance, all UPI links should be enabled.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

SNC (sub NUMA cluster) partitions the cores and last level cache into clusters with each cluster bound to a set of memory controllers in the system. SNC improves average latency to the last level cache.

Disabled is the default setting.

Select the appropriate snoop mode based on the workload.

You cannot select a snoop mode once and for all. The mode will be changed if the current hardware configuration does not support the desired mode. Also not that SNC has priority over the snoop mode.

Home Snoop Plus is the default setting.

XPT prefetch is a mechanism that enables a read request that is being sent to the last level cache to speculatively issue a copy of that read to the memory controller prefetching.

Enabled is the default setting.

UPI prefetch is a mechanism to get the memory read started early on DDR bus.

Enable/Disable Total Memory Encryption (TME). Disabled is the default setting.

Enable/Disable SGX Factory Reset.

When enabled, it will erase all registration data on subsequent boot, and will additionally force an Initial Platform Establishment flow when SGX is enabled. Disabled is the default setting.

• [Disabled] (ALL2ALL)

• [Hemisphere] (2 clusters)

• [Quadrant] (4 clusters, not supported on ICX)

[Auto]: The level of SST enablement is controlled automatically based on the number of CPU cores enabled in UEFI. Auto is the default setting.

[Base]: Effectively disabled SST.

[Config1]/[Config2]: Force the SST cores limits based on the config option selected.

F1 LLC prefetcher is an additional prefetch mechanism on top of the existing prefetchers that prefetch data into the core DCU and MLC. Enabling LLC prefetch gives the core prefetcher the ability to prefetch data directly into the LLC without necessarily filling into the MLC.

One of 4 variables (IRQThreshold, StaleAtoS, CRQoSConfiguration, L2RFOPrefetchDisable) used to optimize performance for SAP HANA on servers with 2-hop memory configurations such as 4-socket ring, 6-socket and 8-socket configurations. The Auto option makes the L2 prefetcher less aggressive and lowers NT write bandwidth. The Disabled menu option limits burstiness and reduces snooping.

Enable/Disable trust for the system's PECI (Platform Environment Control Interface).

Select [Disabled] if a higher level of security is required. When [Disabled], some functions such as memory and I/O utilization reporting may not work. Enabled is the default setting.

Select the number of cores enabled within each CPU package.

All is the default setting.

The number "n" is the maximum core count supported by the installed processor. For example, if the installed processor supports 6 cores, the options will show All, 1, 2, 3, 4, and 5.

Select the desired CPU UPI link frequency.

[Maximum Performance] mode maximizes performance.

[Balanced] mode offers a balance between performance and power.

[Minimal Power] mode maximizes power savings.

When a preset mode is selected, the low-level settings are not changeable and will be grayed out. To change the settings, choose System Settings > Operating Modes > Choose Operating Mode > Custom Mode.

If the CPU frequency limits are being controlled through application software, leave this menu item at the default ([Full turbo uplift]), choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" and [Enabled] in "Turbo Mode" located under "System Setting" submenu.

Allows CPU to automatically demote to C1. Takes effect after reboot.

Allows CPU to automatically undemote from C1. Takes effect after reboot.

Set the desired power management level for the CPU UPI interface.

[L1] is the most power-efficient but has longer latency compared to [L0p] or [Disabled].

If the CPU frequency limits are being controlled through application software, leave this menu item at the default ([Full turbo uplift]), choose [Custom Mode] for "Choose Operating Mode" in "Operating Modes" and [Enabled] in "Turbo Mode" located under "System Setting" submenu.