Chapter 4: UEFI BIOS
87
Degrade Precedence
Use this feature to select the degrading precedence option for Ultra Path Interconnect (UPI)
connections. Select Topology Precedent to degrade UPI features if system options are in
The options are Topology Precedence and Feature Precedence.
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 WCiLF.
SNC
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)
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
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