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Chapter 7: BIOS
Rank Interleaving
This feature allows the user to select a rank memory interleaving method. The
options are Auto, 1 Way, 2 Way, 4, Way, and 8 Way.
Patrol Scrub
Patrol Scrubbing is a process that allows the CPU to correct correctable memory
errors detected on a memory module and send the correction to the requestor
(the original source). When this item is set to Enabled, 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 Enabled and Disabled.
Demand Scrub
Demand Scrubbing is a process that allows the CPU to correct correctable
memory errors found on a memory module. When the CPU or I/O issues a
demand-read command, and the read data from memory turns out to be a
correctable error, the error is corrected and sent to the requestor (the original
source). Memory is updated as well. Select Enabled to use Demand Scrubbing
for ECC memory correction. The options are Enabled and Disabled.
Data Scrambling
Select Enabled to enable data scrubbing and ensure data security and integrity.
The options are Disabled and Enabled.
DRAM RAPL (Running Average Power Limit)
This item allows the user to select the average power limit setting when a DRAM
module is in operation. The options are Disabled, Mode 0, and Mode 1.
Device Tagging
Select Enabled to support device tagging. The options are Disabled and En-
abled.
Thermal Throttling
Throttling improves reliability and reduces power consumption in the proces-
sor via automatic voltage control during processor idle states. The options are
Disabled and CLTT (Closed Loop Thermal Throttling).
OLTT (Open Loop Thermal Throttling) Peak BW (Bandwidth) %
This item sets a percentage of the peak bandwidth allowed for Open Loop
Thermal Throttling. The range is between 25% and 100%. The default settling
is 50 (%).
7-11
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