Dell PowerEdge T550 Integrated Remote Access Controller 9 Attribute Registry - Page 319

BIOS.ProcSettings.ProcX2Apic (Read or Write) Description Enable or Disable x2APIC mode. Compared to the traditional xAPIC architecture, x2APIC extends processor addressability and enhances interrupt delivery performance. BIOS will force x2APIC to be enabled if there are 256 or more processor threads Legal Values ● Enabled ● Disabled Default Value Not Applicable Write Privilege Server Control License Required iDRAC Express or iDRAC Enterprise Dependency Not applicable BIOS.ProcSettings.QpiBandwidthPriority (Read or Write) Description Determines the number and priority of requests on the QuickPath Interconnect (QPI) bus. The QPI connects the processor sockets. The Compute setting favors computational traffic while the I/O setting is optimized for IO intensive workloads. Legal Values ● InputOutput ● Compute Default Value Not Applicable Write Privilege Server Control License Required iDRAC Express or iDRAC Enterprise Dependency Not applicable BIOS.ProcSettings.QpiSpeed (Read or Write) Description The Intel QuickPath Interconnect (QPI) Speed option in the Processor section governs the frequency of the QPI links between the populated processors. The user should be aware that standard and basic bin Intel processors of this architecture support slower QPI link speeds than the advanced parts provide. Maximum Data Rate indicates that the BIOS will run the QPI links at the maximum frequency supported by the processor. Specific frequencies supported by the processor, which can vary, can also be selected. For best performance, the QPI link speed should be left at the maximized setting, for any reduction in QPI speed will affect the performance of non-local memory accesses and cache coherency traffic. In addition, access to non-local I/O devices from a particular core can be slowed by the reduction of QPI link speed. However, in some cases it may be advisable to reduce QPI speed where power considerations outweigh the performance cost. For users considering reducing the QPI link speeds, memory and I/O accesses should be localized to the nearest NUMA node to minimize the performance impact. Only available if 2 or more CPUs are present. Legal Values ● MaxDataRate ● 9GTps ● 8GTps ● 7GTps ● 6GTps Default Value Not Applicable Write Privilege Server Control License Required iDRAC Express or iDRAC Enterprise Dependency Not applicable BIOS Attributes 319