Chapter 5: UEFI BIOS
77
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 conges-
tion 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 reader 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
XPT Prefetch 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.
Local/Remote Threshold
This feature allows the user to set the threshold for the Interrupt Request (IRQ) signal,
which handles hardware interruptions. The options are Disable, Auto, Low, Medium,
and High.
Stale AtoS
This feature optimizes A to S directory. When all snoop responses found in directory A
are found to be Rspl, then all data is moved to directory S and is returned in S-state.
The options are Disable, Enable, and Auto.
LLC Dead Line Alloc
LLC. The options are Disable, Enable, and Auto.
Isoc Mode
Isochronous (Isoc) mode allows time-sensitive processes to be given priority. The options
are Disable, Enable, and Auto.
Memory Conguration
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