CLI Guide

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.ProcSettings.RtidSetting (Read or Write)
Description
Manipulates Requestor Transaction IDs, which are QuickPath Interconnect (QPI) resources. Generally
should be left at Disabled, as no workloads have been identified as benefitting from the manipulation
of this feature. NOTE: Enabling this option almost always results in negative impacts to overall system
performance.
Supported on 13G, except value systems. Not supported on 14G.
Legal Values
● Disabled
● Enabled
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
BIOS.ProcSettings.SubNumaCluster (Read or Write)
Description
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.
Legal Values
● Enabled
● Disabled
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
BIOS Attributes 339