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Chapter 6: UEFI BIOS
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IOAT
(Intel IO Acceleration Technology)
Configuration
Disable TPH (TLP Processing Hint)
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 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
No
and Yes.
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.
Interrupt Remapping
If this feature is set to Enable, I/O DMA transfer remapping and device-generated
interrupts will be supported. The options are
Enable
and Disable.
PassThrough DMA
Select Enable for the Non-Isoch VT-d engine to pass through DMA (Direct Memory
Access) to enhance system performance. The options are
Enable
and Disable.
ATS
Select Enable to enable ATS (Address Translation Services) support for the Non-Isoch
VT-d engine to enhance system performance. The options are
Enable
and Disable.
Posted Interrupt
Select Enable to support VT_D Posted Interrupt which will allow external interrupts to
be sent directly from a direct-assigned device to a client machine in non-root mode