User`s manual

4-10

X8DTU/X8DTU-F User’s Manual

North Bridge Conﬁ guration

This feature allows the user to conﬁ gure Intel IOH settings.

Intel I/OAT

The Intel I/OAT (I/O Acceleration Technology) signiﬁ cantly reduces CPU overhead

by leveraging CPU architectural improvements, freeing resources for more other

tasks. The options are Disabled and Enabled.

DCA (Direct Cache Access) Technology

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 Prefetcher is used with TOE components to prefetch data in order to

shorten execution cycles and maximize data processing efﬁ ciency. Prefetching too

frequently 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],

and [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 options are Enabled and Disabled.

Active State Power-Management

Select Enabled to use the power management for signal transactions between the

PCI Express L0 and L1 Links. Select Enabled to conﬁ gure PCI-Exp. L0 and L1 Link

power states. The options are Disabled and Enabled.

IOH PCI-E 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 128B.