Table 5. Processor Settings details (continued)
Option Description
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.
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.
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
Controller (iMC) directly. This option is set to Enabled by
default.
XPT Prefetch This option is set to Enabled by default.
LLC Prefetch Enables or disables the LLC Prefetch on all threads. This
option is set to Enabled by default.
Dead Line LLC Alloc Enables or disables the Dead Line LLC Alloc. This option is set
to Enabled by default. You can enable this option to enter the
dead lines in LLC or disable the option to not enter the dead
lines in LLC.
Directory AtoS Enables or disables the Directory AtoS. AtoS optimization
reduces remote read latencies for repeat read accesses
without intervening writes. This option is set to Disabled by
default.
Logical Processor Idling Enables you to improve the energy efficiency of a system. It
uses the operating system core parking algorithm and parks
some of the logical processors in the system, which in turn
allows the corresponding processor cores to transition into a
lower power idle state. This option can only be enabled if the
operating system supports it. It is set to Disabled by default.
NOTE: This feature is not supported if CPU Power
Management is set to Maximum Performance.
8 Pre-operating system management applications
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