Chapter 4: UEFI BIOS
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• PCI-E Port Link Status
• PCI-E Port Link Max
• PCI-E Port Link Speed
PCI-E Port Max (Maximum) Payload Size (Available for CPU 1 Confi guration only)
Select Auto for the system BIOS to automatically set the maximum payload value for a
PCI-E device specifi ed by to user for system performance enhancement. The options are
Auto, 128B, and 256B.
IOAT Confi guration
Disable TPH
TPH (TLP Processing Hint) is used for data-tagging with a destination ID and a few
important attributes. It can send critical data to a particular cache without writing through
to memory. Select No in this item for TLP Processing Hint support, which will allow a "TPL
request" to provide "hints" to help optimize the processing of each transaction occurred in
the target memory space. The options are Yes and No.
Prioritize TPH (TLP Processing Hint)
Select Yes to prioritize the TPL requests that will allow the "hints" to be sent to help facilitate
and optimize the processing of certain transactions in the system memory. The options are
Enable and Disable.
Relaxed Ordering
Select Enable to allow certain transactions to be processed and completed before other
transactions that have already been enqueued. The options are Disable and Enable.
Intel VT for Directed I/O (VT-d)
Intel® VT for Directed I/O (VT-d)
Select Enable to use Intel Virtualization Technology support for Direct I/O VT-d by reporting
the I/O device assignments to the VMM (Virtual Machine Monitor) through the DMAR
ACPI tables. This feature offers fully-protected I/O resource sharing across Intel platforms,
providing greater reliability, security and availability in networking and data-sharing. The
options are Enable and Disable.
ACS (Access Control Services) Control
Select Enable to program Access Control Services to Chipset PCI-E Root Port Bridges.
Select Disable to program Access Control Services to all PCI-E Root Port Bridges. The
options are Enable and Disable.
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