IO Menu
Note -
PCIe slot 1 is nonfunctional in single-processor systems.
PCI Subsystem Settings
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PCI 64 Bit Resources Allocation
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Enable (default) or disable 64-bit capable devices to be
decoded in the 4G address space. This setting is available only
if the system supports 64-bit decoding.
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Maximum Payload
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Set the Maximum Payload of the PCI Express device or allow the
System BIOS to select the value.
Auto (default)/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048
Bytes/4096 Bytes
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Maximum Read Request
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Set the Maximum Read Request of the PCI Express device or
allow the System BIOS to select the value.
Auto (default)/128 Bytes/256 Bytes/512 Bytes/1024 Bytes/2048
Bytes/4096 Bytes
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PCIe Hot-Plug Support
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Enable (default) or disable the OS to support PCIe
hot-plug.
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IO Virtualization
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VT-d
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Enable (default) or disable Intel Virtualization Technology
for directed I/O (VT-d) by reporting the I/O device assignment
to VMM through DMA remapping reporting (DMAR) Advance
Configuration Power Interface (ACPI) tables.
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ACS
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Enable programs Access Control Services (ACS) to toggle peer
to peer transactions between PCIe devices. Disable (default)
programs ACS to only chipset PCIe root ports bridges for IOMMU
separation.
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SR-IOV Support
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Enable (default) or disable Single Root I/O Virtualization
(SR-IOV) to configure devices into multiple virtual devices that
can be used on virtual OS installations. If supported by the
hardware and set to enabled, all devices on the system that are
SR-IOV capable are configured to support SR-IOV and I/O
resources are allocated to the device as normal. If set to
disabled, I/O resources are not allocated to the device.
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ARI
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If Alternate Routing ID (ARI) is supported by the hardware and
set to enabled (default), devices are permitted to locate
virtual functions (VFs) in function numbers 8 to 255 of the
captured bus number, instead of normal function numbers 0 to
7.
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IOAT Configuration
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Intel IOAT
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Enable (default) or disable Intel I/O Acceleration Technology
(I/OAT) devices to offload memory copies from the processor
using direct memory accesses (DMA) to improve performance on I/O
transactions.
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DCA Support
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Enable (default) Direct Cache Access (DCA) for a capable I/O
device, such as a network controller, to place data directly
into the CPU cache, reducing cache misses and improving
application response times.
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PCIE Hardware Slot Configuration
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Slot 1 Hardware Configuration
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Displays and provides options to configure hot-plug
functionality or FM10K bifurcation for the PCIe HBA slot. FM10K
bifurcation allows an Ethernet card to appear as multiple
interfaces.
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PCIE Slot Hardware Configuration
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Enable or disable hot-plug or FM10K bifurcation, which allows
an Ethernet card to appear as multiple interfaces.
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Slot 2, Slot 3, and Slot 4
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See Slot 1 description.
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Internal Devices
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NET0
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Displays and provides options to change the internal device
settings.
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PCI-E UEFI Driver Enable
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Enable (default) or disable PCI-E UEFI Driver. If set to
enabled, UEFI Driver for the card executes as normal. If set to
disabled, UEFI Driver for the card is not copied into memory and
the execution of the UEFI Driver is inhibited.
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NET1 and NET2
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See NET0 description.
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Add-in Cards
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Slot 1
Note -
PCIe slot 1 is nonfunctional in single-processor
systems.
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Displays and provides options to change the settings of the
devices in PCIe slots.
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IO Enable
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Disable or enable (default) IO
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PCI-E UEFI Driver Enable
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Enable (default) or disable PCI-E UEFI Driver. If set to
enabled, UEFI Driver for the card executes as normal. If set to
disabled, UEFI Driver for the card is not copied into memory and
the execution of the UEFI Driver is inhibited.
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PCIE Slot DDIO
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Enable (default) or disable DDIO Use_Allocating_Flow_WR for
this PCIe slot.
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Slot 2, Slot 3, and Slot 4
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See Slot 1 description.
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