Dell PowerEdge R840 EMC Installation and Service Manual - Page 33

Slot Disablement, Table 5. Slot Disablement

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Option Integrated Network Card 1 Description Enables or disables the integrated network card (NDC). When set to Disabled, the NDC is not available to the operating system (OS). This option is set to Enabled by default. NOTE: If set to Disabled (OS), the Integrated NICs might still be available for shared network access by iDRAC. 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. I/O Snoop HoldOff Enables you to select the number of cycles PCI I/O can withhold snoop requests from the CPU to allow time to Response complete its own write to LLC. This setting can help improve performance on workloads where throughput and latency are critical. 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 will be used as the primary display. BIOS will output displays to both the primary add-in video and the embedded video during POST and pre-boot 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 re-arrange the cards in the slots in order to control which card is the primary video. 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 OS. This option is set to Disabled by default. Memory Mapped Enables or disables the support for the PCIe devices that need large amounts of memory. Enable this option only I/O above 4 GB for 64-bit operating systems. This option is set to Enabled by default. Memory Mapped When set to 12 TB, the system will map MMIO base to 12 TB. Enable this option for an OS that requires 44 bit I/O Base PCIe addressing. Slot Disablement About this task The Slot Disablement screen details are explained as follows: 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 startup. If the slot is disabled, both the Option ROM and UEFI drivers are disabled. Only slots that are present on the system will be available for control. Table 5. Slot Disablement Slot number Description Slot 1 Enables or disables or only the boot driver is disabled for the PCIe slot 1. This option is set to Enabled by default. Slot 2 Enables or disables or only the boot driver is disabled for the PCIe slot 2. This option is set to Enabled by default. Pre-operating system management applications 33

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Option
Description
Integrated
Network Card 1
Enables or disables the integrated network card (NDC). When set to
Disabled
, the NDC is not available to the
operating system (OS). This option is set to
Enabled
by default.
NOTE:
If set to Disabled (OS), the Integrated NICs might still be available for shared network
access by iDRAC.
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.
I/O Snoop HoldOff
Response
Enables you to select 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.
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 will be used as the primary display. BIOS will output displays to both the primary
add-in video and the embedded video during POST and pre-boot 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 re-arrange
the cards in the slots in order to control which card is the primary video.
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 OS. 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 will map MMIO base to 12 TB. Enable this option for an OS that requires 44 bit
PCIe addressing.
Slot Disablement
About this task
The
Slot Disablement
screen details are explained as follows:
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 startup. If the slot is
disabled, both the Option ROM and UEFI drivers are disabled. Only slots that are present on the system will be
available for control.
Table 5. Slot Disablement
Slot
number
Description
Slot 1
Enables or disables or only the boot driver is disabled for the PCIe slot 1. This option is set to
Enabled
by default.
Slot 2
Enables or disables or only the boot driver is disabled for the PCIe slot 2. This option is set to
Enabled
by default.
Pre-operating system management applications
33