Dell PowerEdge T550 EMC BIOS and UEFI Reference Guide - Page 7
Processor Settings, Table 4. Memory Settings details continued, Table 5. Processor Settings details
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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. 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 Hardware Prefetcher DCU Streamer Prefetcher 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. Enables or disables the hardware prefetcher. This option is set to Enabled by default. Enables or disables the Data Cache Unit (DCU) streamer prefetcher. This option is set to Enabled by default. Pre-operating system management applications 7
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