Supermicro X13DEG-OA User Manual page 114

Super X13DEG-OA User's Manual
Link L0p Enable
Select Enable for the system BIOS to enable Link L0p support which will allow the CPU
to reduce the UPI links from full width to half width in the event when the CPU's workload
is low in an attempt to save power. This feature is available for the system that uses
Intel processors with UPI technology support. The options are Disable, Enable, Auto,
and Full L0p Enable.
Note 1: You can change the performance settings for non-standard applications by
using this parameter. It is recommended that the default settings be used for standard
applications.
Note 2: The option of Full L0p Enable is available when the 5th Gen Intel Xeon Scalable
Series processor is used.
Link L1 Enable
Select Enable for the BIOS to activate Link L1 support which will power down the UPI links
to save power when the system is idle. This feature is available for the system that uses
Intel processors with UPI technology support. The options are Disable, Enable, and Auto.
Note: Link L1 is an excellent feature for an idle system. L1 is used during Package
C-States when its latency is hidden by other components during a wakeup.
KTI Prefetch
Use this feature to configure the Prefetch setting supported by Keizer Technology
Interconnect (KTI), also known as Intel Ultra Path Interconnect (UPI) Technology. Select
Enable for the KTI prefetcher to preload the L1 cache with data deemed relevant, which
will allow the memory read to start earlier on a DDR bus in an effort to reduce latency.
Select Auto for the KTI prefetcher to automatically preload the L1 cache with relevant
data whenever is needed. The options are Disable, Enable, and Auto.
IO Directory Cache (IODC)
Select Enable for the IODC 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 the address range. Each cluster is connected to a subset of the
memory controller. Enable this feature to improve average latency and reduce memory
access congestion for higher performance. The options are Auto, Disable, Enable SNC2
(2-clusters), and Enable SNC4 (4-clusters).
Note: The option of Enable SNC4 (4-clusters) depends on your system configuration
and the processor.
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