Supermicro X12DSC-A6 User Manual page 92

Super X12DSC-A6 User's Manual
Snoop Throttle Configuration
Use this feature to set the level of snoop throttle for the PCH, which will determine how
much speed to decrease in operation when the system is in the snoop state. The options
are Disabled, Low, Medium, High, and Auto.
PCIe Remote P2P (Peer-to-Peer) Relaxed Ordering
Select Disable to support PCIe remote peer-to-peer relaxed writing ordering, which will al-
low hardware to enforce peer-to-peer write ordering. The options are Disable and Enable.
Stale AtoS (A to S)
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 the user to configure the Integrated Memory Controller (iMC) settings.
Enhanced PPR
Use this feature to enable or disable Enhanced PPR function. The options are Disable
and Enable.
Operation Mode (Available when "Enhanced PPR" is set to Enable)
Use this feature to set Operation Mode. The options are Test Only and Test and Repair.
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