Processor Settings details
About this task
The
Processor Settings
screen details are explained as follows:
Option
Description
Logical Processor
Enables or disables the logical processors and displays the number of logical processors. If this option is set to
Enabled
, the BIOS displays all the logical processors. If this option is set to
Disabled
, the BIOS displays only one
logical processor per core. This option is set to
Enabled
by default.
CPU Interconnect
Speed
Enables you to govern the frequency of the communication links among the processors in the system.
NOTE:
The standard and basic bin processors support lower link frequencies.
The options available are
Maximum data rate
,
10.4 GT/s
, and
9.6 GT/s
. This option is set to
Maximum data
rate
by default.
Maximum data rate indicates that the BIOS runs the communication links at the maximum frequency that is
supported by the processors. You can also select specific frequencies that the processors support, which can
vary.
For best performance, you should select
Maximum data rate
. Any reduction in the communication link frequency
affects the performance of non-local memory accesses and cache coherency traffic. Besides, it can slow access
to non-local I/O devices from a particular processor.
However, if power-saving considerations outweigh performance, you might want to reduce the frequency of the
processor communication links. If you do this, you should localize memory and I/O accesses to the nearest NUMA
node to minimize the impact to system performance.
Virtualization
Technology
Enables or disables the virtualization technology for the processor. This option is set to
Enabled
by default.
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.
Software
Prefetcher
Enables or disables the software 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
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. Enables or disables the Sub NUMA Cluster. This option is set to
Disabled
by default.
UPI Prefetch
Enables you to get the memory that is read started early on DDR bus. The Ultra Path Interconnect (UPI) Rx path
will spawn the speculative memory that is read to Integrated Memory Controller (iMC) directly. This option is set
to
Enabled
by default.
LLC Prefetch
Enables or disables the LLC Prefetch on all threads. This option is set to
Disabled
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.
Intel SST-BF
Enable Intel SST-BF. This option is displayed if Performance Per Watt (operating system) or Custom (when
OSPM is enabled) system profiles are selected. It is set to
Disabled
by default.
Pre-operating system management applications
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