Table 28. Processor Settings details (continued)
Option Description
the DMAR table. In general, only virtualized environments
such
as VMware®, ESX™, Microsoft Hyper-V®, Red Hat® KVM,
and other virtualized operating systems will take advantage of
these features. Disabling this feature is not known to
significantly alter the performance or power characteristics of
the
system, so leaving this option Enabled is advised for most
cases.
Directory Mode Enables or disables the directory mode. This option is set to
Enabled by default.
Kernel DMA Protection
When set to Enabled, using IOMMU, BIOS and Operating
System will enable direct memory access protection
for DMA capable peripheral devices. Enable IOMMU Support
to use this option. When set to Enabled, using
Virtualization Technology, BIOS and Operating System will
enable direct memory access protection for DMA capable
peripheral devices.
Enable Virtualization Technology to use this option. This
option is set to Disabled by default. It is enabled for Secure
Launch (Firmware Protection) support on Windows 2022.
Address Translation Services(ATS) This option is set to Enabled by default. ATS provides
an interface between Chipset's address translation and
protection table to translate DMA addresses to host
addresses.
Adjacent Cache Line Prefetch Optimizes the system for applications that need high
utilization of sequential memory access. This option is set
to Enabled by default. You can disable this option for
applications that need high utilization of random memory
access.
Hardware Prefetcher Enables or disables the hardware prefetcher. This option is set
to Enabled by default.
DCU Streamer Prefetcher Enables or disables the Data Cache Unit (DCU) streamer
prefetcher. This option is set to Enabled by default.
DCU IP Prefetcher Enables or disables the Data Cache Unit (DCU) IP prefetcher.
This option is set to Enabled by default.
System Isochronous Mode This feature reduces latency of memory transactions at the
expense of bandwidth. Enabling it may be best for real-time
audio and video streaming applications. Disabling it may be
best for applications needing highest memory bandwidth
especially with large number of cores under heavy utilization.
This option is set to Disabled by default.
Sub NUMA Cluster Enables or disables the Sub NUMA Cluster. This option is set
to Disabled by default.
MADT Core Enumeration Specifies the MADT Core Enumeration. This option is set
to default in Round Robin. Linear option supports industry
core enumeration whereas, Round Robin option supports Dell
optimized core enumeration.
UPI Prefetch Enables you to get the memory read started early on DDR
bus. The Ultra Path Interconnect (UPI) Rx path spawns
the speculative memory that is read to Integrated Memory
34 Pre-operating system management applications
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