Cisco Systems 57712, UCSCPCIEBTG manual Direct Cache Access, Processor C3 Report

BIOS Parameters by Server Model

Advanced BIOS Parameters for C260 Servers

Name Description

Intel VT-d Address Translation Services Whether the processor supports Intel VT-d Address Translation Services (ATS). This can be one of the following:

• Disabled—The processor does not support ATS.

• Enabled—The processor uses VT-d ATS as required.

Intel VT-d PassThrough DMA Whether the processor supports Intel VT-d Pass-through DMA. This can be one of the following:

	• Disabled—The processor does not support pass-through
	DMA.
	• Enabled—The processor uses VT-d Pass-through DMA
	as required.
Direct Cache Access	Allows processors to increase I/O performance by placing data
	from I/O devices directly into the processor cache. This setting
	helps to reduce cache misses. This can be one of the following:
	• Disabled—Data from I/O devices is not placed directly
	into the processor cache.
	• Enabled—Data from I/O devices is placed directly into
	the processor cache.
Processor C3 Report	Whether the BIOS sends the C3 report to the operating system.
	When the OS receives the report, it can transition the processor
	into the lower C3 power state to decrease energy usage while
	maintaining optimal processor performance. This can be one of
	the following:
	• Disabled—The BIOS does not send the C3 report.
	• —The BIOS sends the C3 report using the ACPI C2
	format, allowing the OS to transition the processor to the
	C3 low power state.
	• —The BIOS sends the C3 report using the ACPI C3
	format, allowing the OS to transition the processor to the
	C3 low power state.

Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5

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