Supermicro X8DTN+ [77/99] Southbridgeconfiguration

Chapter 4: AMI BIOS

4-11

ized, dedicated processor that is installed on an add-on card or a network card to

handle some or all packet processing of this add-on card.) When this feature is set

to Enabled, it will enhance overall system performance by providing direct memory

access for data transferring. The options are Enabled and Disabled.

DCA (Direct Cache Access) Technology (Available when Intel I/O AT is

enabled)

This feature works in conjunction with the Intel I/O AT (Acceleration Technology) to

accelerate the performance of the TOE device. When this feature set to Enabled, it

will enhance overall system performance by providing direct cache access for data

transferring. The options are Enabled and Disabled.

DCA Prefetch Delay

A DCA Prefetch is used with TOE components to prefetch data in order to shorten

execution cycles and maximize data processing efciency. Prefetching too fre-

quently can saturate the cache directory and delay necessary cache accesses. This

feature reduces or increases the frequency the system prefetches data. The options

are [8], [16], [24], [32], [40], [48], [56], [64], [72], [80], [88], [96], [104], [112], [120]

Intel VT-d

Select Enabled to enable Intel's Virtualization Technology support for Direct I/O VT-d

by reporting the I/O device assignments to VMM through the DMAR ACPI Tables.

This feature offers fully-protected I/O resource-sharing across the Intel platforms,

providing the user with greater reliability, security and availability in networking and

data-sharing. The settings are Enabled and Disabled.

Active State Power-Management

Select enable to congure the power states of PCI-Express L0s and L1 links. The

options are Enabled and Disabled.

IOH PCIE Max Payload Size

Some add-on cards perform faster with the coalesce feature, which limits the

payload size to 128B; while others, with a payload size of 256B which inhibits the

coalesce feature. Please refer to your add-on card user guide for the desired setting.

The options are 256B and 128MB.

SouthBridgeConguration

This feature allows the user to congure the settings for the Intel South Bridge.

USB Functions

Select Enabled to use the onboard USB ports. The Options are: Disabled, and

Enabled. (If this item is set to Enabled, USB 2.0 Controller will be enabled.)