Chapter 4: BIOS
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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.
XPT Remote Prefetch
Use this feature to enable or disable Extended Prediction Table (XPT) Remote Prefetch.
The options are Disable, Enable, and
Auto
.
KTI Prefetch
If this feature is enabled, the KTI Prefetcher preloads the L1 cache with data deemed
relevant to allow the memory read to start earlier on a DDR bus in an effort to reduce
latency. The options are Disable, Enable, and
Auto
.
Local/Remote Threshold
Use this feature to set the threshold for the IRQ signals that handle hardware interrup-
tions. The options are Disable,
Auto
, Low, Medium, and High.
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)
Use this feature to enable or disable Sub NUMA Clustering. Disable this feature to support
1-cluster and enable to support 2-clusters. The options are
Disable
and SNC2 (2-clusters)
XPT Prefetch
Use this feature to enable or disable XPT Prefetch support, which allows an LLC request
to be duplicated and sent to an appropriate memory controller based on the recent LLC
history to reduce latency. The options are Disable, Enable, and
Auto
.
Snoop Throttle Configuration
Use this feature to select the level of snoop throttle setting. The options are Disabled,
Low, Medium, High, and
Auto
.
