Supermicro X11SPG-TF User Manual page 79

Chapter 4: BIOS
Link L0p Enable
Select Enable for the QPI to enter the L0p state for power saving. The options are Dis-
able, Enable, and Auto.
Link L1 Enable
Select Enable for the QPI to enter the L1 state for power saving. The options are Dis-
able, Enable, and Auto.
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 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 is a feature that 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 ad-
dress 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 is a feature that 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.
Locate/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.
79