Reference Guide

BIOS.IntegratedDevices.SnoopHldOff (Read or Write)
Description
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.
Legal Values
● Roll256Cycles
● Roll512Cycles
● Roll1KCycles
● Roll2KCycles
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
BIOS.IntegratedDevices.SriovGlobalEnable (Read or Write)
Description
Enables or disables the BIOS configuration of Single Root I/O Virtualization (SR-IOV) devices. Enable this
feature if booting to a virtualization operating system that recognize SR-IOV devices.
Legal Values
● Disabled
● Enabled
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
BIOS.IntegratedDevices.Usb3Setting (Read or Write)
Description
Controls USB 3.0 support. When set to Disabled, BIOS disables USB 3.0 mode for all the USB3.0 ports.
The USB devices operate at USB2.0 mode. When set to Enabled, BIOS operates all USB3.0 ports at
USB2.0 mode during POST, and switches them to USB3.0 mode right after the operating system (OS)
boots. You must select this option only if the operating system (such as. Windows Server 2012) has a
native USB 3.0 driver. Otherwise none of the USB devices will work after boot. The Auto option is
available only on workstation servers. If this option is selected, the BIOS leaves all USB 3.0 ports at USB
2.0 mode, and a special OS switching driver is required to set the USB3.0 port to USB3.0 mode.
Microsoft Windows 7 has switching driver capability.
Legal Values
● Auto
● Enabled
● Disabled
Default Value Not Applicable
Write Privilege Server Control
License Required iDRAC Express or iDRAC Enterprise
Dependency Not applicable
BIOS Attributes 113