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Chapter 4: BIOS
Link L1 Enable
Select Enable to enable Link L1 (Level 1 link). The options are Disable, Enable, and Auto.
IO Directory Cache
Select Enable for the IODC (I/O Directory Cache) to generate snoops instead of generating
memory lockups for remote IIO (InvIToM) and/or WCiLF (Cores). Select Auto for the IODC to
generate snoops (instead of memory lockups) for WCiLF (Cores). 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.
Local/Remote Threshold
This feature allows the user to set the threshold for the Interrupt Request (IRQ) signal, which
handles hardware interruptions. The features are Disable, Enable, 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 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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