Chapter 4: UEFI BIOS
77
Link L0p Enable
Select Enable to enable Link L0p. The options are Disable, Enable, and
Auto
.
Link L1 Enable
Select Enable to enable Link L1 (Level 1 link). The options are Disable, Enable, and
Auto
.
IO Directory Cache (IODC)
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
Select Enable to use "Sub NUMA Clustering" (SNC), which supports full SNC (2-cluster)
interleave and 1-way IMC interleave. Select Auto for 1-cluster or 2-cluster support depending
on the status of IMC (Integrated Memory Controller) Interleaving. The options are
Disable
,
Enable, and Auto.
XPT Prefetch
Select Enable to support XPT Prefetching to enhance system performance. The options
are Enable,
Disable
, and Auto.
KTI Prefetch
Select Enable to support KTI Prefetching to enhance system performance. The options
are
Enable
and Disable.
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 (A to S)
The in-memory directory has three states: I, A, and S states. The I (-invalid) state indicates
that the data is clean and does not exist in the cache of any other sockets. The A (-snoop
All) state indicates that the data may exist in another socket in an exclusive or modi
fi
ed
state. The S state (-Shared) indicates that the data is clean and may be shared in the
caches across one or more sockets. When the system is performing "read" on the memory
and if the directory line is in A state, we must snoop all other sockets because another
socket may have the line in a modi
fi
ed state. If this is the case, a "snoop" will return the
modi
fi
ed data. However, it may be the case that a line "reads" in an A state, and all the
snoops come back with a "miss". This can happen if another socket reads the line earlier
and then has silently dropped it from its cache without modifying it. If the "Stale AtoS"
feature is enabled, a line will transition to the S state when the line in the A state returns
only snoop misses. That way, subsequent reads to the line will encounter it in the S state
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