Dell PowerEdge R650 EMC BIOS and UEFI Reference Guide - Page 7

Persistent Memory details, Processor Settings

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Table 4. Memory Settings details (continued) Option Description Dark Memory: Total Memory Available Enables or Disables dark memory feature. Dark Memory feature allows software to change memory size. The option is set to Disabled in default, need to be enabled by personality module. Persistent Memory details The Persistent Memory screen details can be found in the PMem User 's Guide at https://www.dell.com/poweredgemanuals. Processor Settings To view the Processor Settings screen, power on the system, press F2, and click System Setup Main Menu > System BIOS > Processor Settings. Table 5. Processor Settings details Option Logical Processor Description Each processor core supports up to two 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, 11.2 GT/s, 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 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 access and cache coherency traffic. In addition, it can slow access to non-local I/O devices from a particular processor. However, if power saving considerations outweigh performance, reduce the frequency of the processor communication links. Before reducing the frequency, you must localize the memory and I/O access to the nearest NUMA node to minimize the impact to system performance. Virtualization Technology Directory Mode Adjacent Cache Line Prefetch Enables or disables the virtualization technology for the processor. This option is set to Enabled by default. Enables or disables the directory mode. This option is set to Enabled by default. 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. Pre-operating system management applications 7

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Table 4. Memory Settings details (continued)
Option
Description
Dark Memory: Total Memory Available
Enables or Disables dark memory feature. Dark Memory feature allows
software to change memory size. The option is set to
Disabled
in default,
need to be enabled by personality module.
Persistent Memory details
The
Persistent Memory
screen details can be found in the
PMem User 's Guide
at
.
Processor Settings
To view the
Processor Settings
screen, power on the system, press F2, and click
System Setup Main Menu
>
System
BIOS
>
Processor Settings
.
Table 5. Processor Settings details
Option
Description
Logical Processor
Each processor core supports up to two 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
,
11.2 GT/s
,
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
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 access
and cache coherency traffic. In addition, it can slow access to
non-local I/O devices from a particular processor.
However, if power saving considerations outweigh
performance, reduce the frequency of the processor
communication links. Before reducing the frequency, you must
localize the memory and I/O access 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.
Directory Mode
Enables or disables the directory mode. 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.
Pre-operating system management applications
7