Table 16. Integrated Devices details (continued)
Option
Description
Embedded NIC1 and NIC2
Enables or disables the Embedded NIC1 and NIC2. If set to
Disabled (OS)
,
the NIC may still be available for shared network access by the embedded
management controller. Configure the
Embedded NIC1 and NIC2
option
by using the NIC management utilities of the system. This option is set to
Enabled
by default.
I/OAT DMA Engine
Enables or disables the I/O Acceleration Technology (I/OAT) option. I/OAT is
a set of DMA features designed to accelerate network traffic and lower CPU
utilization. Enable only if the hardware and software support the feature. This
option is set to
Disabled
by default.
Embedded Video Controller
Enables or disables the use of Embedded Video Controller as the primary
display. When set to
Enabled
, the Embedded Video Controller will be the
primary display even if add-in graphic cards are installed. When set to
Disabled
, an add-in graphics card is used as the primary display. BIOS will
output displays to both the primary add-in video and the embedded video
during POST and preboot environment. The embedded video will then be
disabled right before the operating system boots. This option is set to
Enabled
by default.
NOTE:
When there are multiple add-in graphic cards installed in the
system, the first card discovered during PCI enumeration is selected as
the primary video. You might have to rearrange the cards in the slots in
order to control which card is the primary video.
I/O Snoop HoldOff Response
Selects the number of cycles PCI I/O can withhold snoop requests, from the
CPU, to allow time to complete its own write to LLC. This setting can help
improve performance on workloads where throughput and latency are critical.
The options available are
256 Cycles
,
512 Cycles
,
1K Cycles
,
2K Cycles
,
4K Cycles
,
8K Cycles
,
16K Cycles
,
32K Cycles
,
64K Cycles
and
128K
Cycles
.This option is set to
2K Cycles
by default.
Current State of Embedded Video
Controller
Displays the current state of the embedded video controller. The
Current
State of Embedded Video Controller
option is a read-only field. If the
Embedded Video Controller is the only display capability in the system (that
is, no add-in graphics card is installed), then the Embedded Video Controller
is automatically used as the primary display even if the
Embedded Video
Controller
setting is set to
Disabled
.
SR-IOV Global Enable
Enables or disables the BIOS configuration of Single Root I/O Virtualization
(SR-IOV) devices. This option is set to
Disabled
by default.
OS Watchdog Timer
If your system stops responding, this watchdog timer aids in the recovery
of your operating system. When this option is set to
Enabled
, the operating
system initializes the timer. When this option is set to
Disabled
(the default),
the timer does not have any effect on the system.
Empty Slot Unhide
Enables or disables the root ports of all the empty slots that are accessible to
the BIOS and operating system. This option is set to
Disabled
by default.
Memory Mapped I/O above 4 GB
Enables or disables the support for the PCIe devices that need large amounts
of memory. Enable this option only for 64-bit operating systems. This option is
set to
Enabled
by default.
Memory Mapped I/O Base
When set to
12 TB
, the system maps the MMIO base to 12 TB. Enable this
option for an operating system that requires 44-bit PCIe addressing. When set
to
512 GB
, the system maps the MMIO base to 512 GB, and reduces the
maximum support for memory to less than 512 GB. Enable this option only for
the 4 GPU DGMA issue. This option is set to
56 TB
by default.
Slot Disablement
Enables or disables the available PCIe slots on your system. The slot
disablement feature controls the configuration of the PCIe cards installed in
the specified slot. Slots must be disabled only when the installed peripheral
card prevents booting into the operating system or causes delays in system
Pre-operating system management applications
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