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Chapter 4: UEFI BIOS
Adjacent Cache Line Prefetch
If this feature is set to Disabled, the CPU will prefetch cache lines for 64 bytes. If set to
Enabled, the CPU will prefetch cache lines for 128 bytes as comprised. The options are
Disabled and Enabled.
Intel (VMX) Virtualization Technology
Select Enabled to use the Intel Virtualization Technology so that I/O device assignments will
be reported to Virtual Memory Management (VMM) through the DMAR ACPI Tables. This
feature offers fully-protected I/O resource sharing across Intel platforms, allowing for greater
reliability, security, and availability in networking and data sharing. The options are Disabled
and Enabled.
PECI
Use this feature to enable or disable Platform Environment Control Interface (PECI). PECI
provides an interface between the processor and external components, such as Super IO
and embedded controllers, to view and configure processor thermal management or power
services. The options are Disabled and Enabled.
AVX
Use this feature to enable or disable Intel Advanced Vector Extensions (AVX) instructions.
When AVX instructions are enabled, performance during demanding high performance
computing (HPC) workloads may increase. This feature only affects performance cores. The
options are Enabled and Disabled.
Active Processor Cores
This feature determines how many cores will be activated. When All is selected, all
Performance-cores will be activated. The number of cores and E-cores are locked together.
The default setting is All.
Hyper-Threading
Select Enabled to support Intel Hyper-Threading Technology to enhance CPU performance.
The options are Enabled and Disabled.
BIST
Use this feature to enable the Built-In Self Test (BIST) at system reset or reboot. The options
are Disabled and Enabled.
AP Threads Idle Manner
Use this feature to set the AP Threads Idle Manner setting. The options are HALT Loop,
MWAIT Loop, and RUN Loop.
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