Chapter 4: BIOS
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memory security, but it will reduce the memory capacity into half. The options are
Disabled
,
Full Mirror Mode, and Partial Mirror Mode.
Correctable Error Threshold
Use this feature to enter the threshold value for correctable memory errors. The default
setting is
512
.
Partial Cache Line Sparing (PCLS)
Select Enabled to support partial cache line sparing, which will allow partial of data
contained in a cache line to be copied in the cache memory for safe-keeping and data
security. The options are Disabled and
Enabled
.
ADDDC (Adaptive Double Device Data Correction) Sparing
Select Enable for Adaptive Double Device Data Correction (ADDDC) support, which will
not only provide memory error checking and correction but will also prevent the system
from issuing a performance penalty before a device fails. Please note that virtual lockstep
mode will only start to work for ADDDC after a faulty DRAM module is spared. The options
are Disabled and
Enabled
.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory errors
detected in a memory module and send the corrections to the requestor (the original
source). When this feature is set to Enable, the IO hub will read and write back one cache
line every 16K cycles if there is no delay caused by internal processing. By using this
method, roughly 64 GB of memory behind the IO hub will be scrubbed every day. The
options are Disabled Enabled, and
Enable at End of POST (Power_On Self Test)
.
PMem Configuration
PMem QoS (Quality of Service)
Select PMem QoS Disabled to prevent DDR4 memory from dropping the performance
when PMem modules are detected in the system. The options are
PMem QoS Disabled
,
Profile 1 - Optimized for 8 PMem modules per socket, and Profile 2 - Optimized for 4/2/1
PMem modules per socket.
PMem Performance Setting
This feature configures the baseline (default) performance setting for the onboard PMmem
memory, which largely depends on workload requirements. Select BW (Bandwidth)
Optimized to optimize PMem performance. The options are
BW Optimized
, and Balanced
Profile.
