User's Manual

DescriptionName
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 Address Translation Services
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.
Intel VT-d PassThrough DMA
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.
Direct Cache Access
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.
Processor C3 Report
Cisco UCS C-Series Servers Integrated Management Controller CLI Configuration Guide, Release 1.5
256 OL-28893-01
BIOS Parameters by Server Model
Advanced BIOS Parameters for C460 Servers