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Chapter 6: UEFI BIOS
Degrade Precedence
Use this feature to set degrade precedence when system settings are in conflict. Select
Topology Precedence to degrade Features. Select Feature Precedence to degrade
Topology. The options are Topology Precedence and Feature Precedence.
Link L0p Enable
Select Enable for Link L0p support. The options are Enable and Disable.
Link L1 Enable
Select Enable for Link L1 support. The options are Enable and Disable.
IO Directory Cache (IODC)
IO Directory Cache is an 8-entry cache that stores the directory state of remote IIO writes
and memory lookups, and saves directory updates. Use this feature to lower cache to cache
(C2C) transfer latencies. The options are Disable, Auto, Enable for Remote InvItoM Hybrid
Push, InvItoM AllocFlow, Enable for Remote InvItoM Hybrid AllocNonAlloc, and Enable for
Remote InvItoM and Remote WViLF.
SNC
Sub NUMA Clustering (SNC) is a feature that breaks up the Last Level Cache (LLC) into
clusters based on address range. Each cluster is connected to a subset of the memory
controller. Enabling SNC improves average latency and reduces memory access congestion
to achieve higher performance. Select Auto for 1-cluster or 2-clusters depending on IMC
interleave. Select Enable for Full SNC (2-clusters and 1-way IMC interleave). The options
are Disable, Enable, and Auto.
XPT Prefetch
XPT Prefetch speculatively makes a copy to the memory controller of a read request being
sent to the LLC. If the read request maps to the local memory address and the recent
memory reads are likely to miss the LLC, a speculative read is sent to the local memory
controller. The options are Disable and Enable.
KTI Prefetch
KTI Pretech enables memory read to start early on a DDR bus, where the KTI Rx path
will directly create a Memory Speculative Read command to the memory controller. The
options are Disable and Enable.
Stale AtoS
This feature optimizes A to S directory. When all snoop responses found in directory A
are found to be RspI, then all data is moved to directory S and is returned in S-state. The
options are Disable, Enable, and Auto.
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