Supermicro X13SEI-TF User Manual page 78

Super X13SEI-TF/-F User's Manual
Stale AtoS
The in-memory directory has three states: I, A, and S states. The I (-invalid) state indi-
cates 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
modified 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 modified state. If this is the case, a "snoop" will
return the modified 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 "Stale
AtoS" 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
and will not have to snoop, saving the latency and snoop bandwidth. Stale "AtoS" may
be beneficial in a workload where there are many cross-socket reads. The options are
Disable, Enable, and Auto.
LLC Dead Line Alloc
Select Enable to opportunistically fill the deadlines in the LLC. The options are Disable,
Enable, and Auto.
Memory Configuration

This feature allows you to configure the Integrated Memory Controller (iMC) settings.
Enforce DDR Memory Frequency POR
Select POR to enforce Plan of Record (POR) restrictions for DDR memory frequency
and voltage programming. The options are POR and Disable.
Memory Frequency
Use this feature to set the maximum memory frequency for onboard memory modules.
The options are Auto, 3200, 3600, 4000, 4400, 4800, 5200, and 5600.
Data Scrambling for DDR5
Select Enable to enable data scrambling for DDR5 modules to enhance memory data
security. The options are Disable and Enable.
Enable ADR
Select Enable for Asynchronous DRAM Refresh (ADR) support to enhance memory
performance. The options are Disable and Enable.
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