Intel Virtualization Technology for Directed I/O (VT-d) by reporting the I/O device assignment to VMM through DMAR ACPI Tables. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.
Hyper-Threading[ALL]:
Enables Hyper Threading(Software Method to Enable Logical Processor threads. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.
Turbo Mode:
Enabling this option allows the processor cores to automatically increase its frequency and increasing
performance if it is running below power, temperature. The default is "Enabled".
SNC:
Sub NUMA Clustering (SNC) is a feature for breaking up the LLC into disjoint clusters based on address range, with each cluster bound to a subset of the memory controllers in the system.
It improves average latency to the LLC and is an important pre-requisite to enabling KTI prefetch and is a replacement for the Cluster-on-Die feature found in previous processors. Values for this BIOS option can be: Auto/Enabled/Disabled.
Default is Disabled.
IMC Interleaving:
This BIOS option controls the interleaving between the Integrated Memory Controllers (IMCs).
If IMC Interleaving is set to 2-way, the memory addresses will be interleaved between the two IMCs.
If IMC Interleaving is set to 1-way, there will be no interleaving. If SNC is enabled, you want 1-way interleave.
If SNC is disabled, you want 2-way interleave. (See also Sub-NUMA Cluster.) Values for this BIOS option can be:
1-way: no interleaving
2-way: interleaving
Auto: Set to MRC default, current default is 2-way interleaving
Default is Auto.
SR-IOV Support:
In virtualization, single root input/output virtualization or SR-IOV is a specification that allows the isolation of the PCI Express resources for manageability and performance reasons.
A single physical PCI Express can be shared on a virtual environment using the SR-IOV specification.
If system has SR-IOV capable PCIe Devices, this option Enables or Disables Single Root IO Virtualization Support. Values for this BIOS option can be: Enabled/Disabled. Default is Enabled.
ENERGY_PERF_BIAS_CFG mode:
This BIOS option allows for processor performance and power optmization. Available settings are:
Performance: High performance with less need for power saving.
Balanced Power: Provides optimal power efficiency.
Power: High power saving with less need for performance.
CPU C6 report:
Enable/Disable CPU C6(ACPI C3) report to OS. During the CPU C6 State, the power to all cache is turned off. Current default is Enable.
Memory Patrol Scrubbing (Default = Enabled):
This option allows for correction of soft memory errors. Over the length of system runtime, the risk of producing multi-bit and uncorrected errors is reduced with this option. Values for this BIOS setting can be:
Enabled: Correction of soft memory errors can occur during runtime.
Disabled: Soft memory error correction is turned off during runtime.
Enforce POR:
Enforce plan of record restrictions for DDR4 frequency. Available settings are: Enable, Disable, and Auto(default; Sets it to MRC default setting; Default is Auto)
Memory Frequency:
When setting Enforce POR to Disable, users can set system memory speed to: Auto(default), 2133, 2400, 2666, and 2933.
LLC dead line alloc:
In the processor non-inclusive cache scheme, MLC evictions are filled into the LLC. When lines are evicted from the MLC, the core can flag them as “dead” (i.e., not likely to be read again). The LLC has the option to drop dead lines and not fill them in the LLC. This can help save space in the LLC and prevent the LLC from evicting useful data. Available settings are:
Disabled: Disabling this option can save space in the LLC by never moving MLC dead lines into the LLC.
Enabled(default): Opportunistically move MLC dead lines into the LLC, if space is available.