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Table 47. Integrated Devices details (continued)
Option
I/O Snoop HoldOff Response
Current State of Embedded Video
Controller
SR-IOV Global Enable
OS Watchdog Timer
Empty Slot Unhide
Slot Disablement
Slot Bifurcation
Serial Communication
To view the Serial Communication screen, power on the system, press F2, and click System Setup Main Menu > System
BIOS > Serial Communication.
NOTE:
The serial port is optional for the PowerEdge XE9640 system. The Serial Communication option is applicable only if
the serial COM port is installed in the system.
46
Pre-operating system management applications
Description
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.
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.
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.
Enables or disables the BIOS configuration of Single Root I/O Virtualization
(SR-IOV) devices. This option is set to Disabled by default.
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.
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.
Enables or boot driver 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. When this option is set to boot driver disabled, both the Option ROM
and UEFI driver from the slot will not run during POST. The system will not
boot from the card and its pre-boot services will not be available. However, the
card is available to the operating system.
Slot n: Enables or only the boot driver is disabled for the PCIe slot n. This
option is set to Enabled by default.
Auto Discovery Bifurcation Settings allows Platform Default Bifurcation
and Manual bifurcation Control.
This option is set to Platform Default Bifurcation by default. The slot
bifurcation field is accessible when set to Manual bifurcation Control and
is grayed out when set to Platform Default Bifurcation.
NOTE:
The slot bifurcation supports on PCIe slot only, does not support
slot type from Paddle card to Riser and Slimline connector to Riser.
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