Chapter 6: UEFI BIOS
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PCI-E Port Max Payload Size
Selecting
Auto
for this feature will enable the motherboard to automatically detect
the maximum Transaction Layer Packet (TLP) size for the connected PCI-E device,
allowing for maximum I/O efficiency. Selecting 128B or 256B will designate maximum
packet size of 128 or 256. The options are 128B, 256B, and
Auto.
IOAT Configuration
Disable TPH
TPH 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 feature 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
No
and Yes.
Prioritize TPH
Use this feature to enable Prioritize TPH support. The options are Enable and
Disable.
Relaxed Ordering
Select Enable to enable Relaxed Ordering support, which will allow certain transac-
tions to violate the strict-ordering rules of PCI bus for a transaction to be completed
prior to 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 for Direct I/O VT-d support
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 Control
This feature allows users to choose whether they want to enable or disable PCI-E Ac-
cess Control Services (ACS) Extended Capability. The options are
Enable
and
Disable.
Interrupt Remapping
Use this feature to enable Interrupt Remapping support, which detects and controls
external interrupt requests. The options are
Enable
and Disable.