HP ROM-Based Setup Utility - Manual (Page 141)

Data Direct I/O
NOTE: This option is available on Gen8 servers with Intel processors.
This option controls the ability for the processor to accelerate I/O operations by reducing the
number of I/O related memory accesses. This option increases I/O performance while reducing
system power and I/O latency and is highly recommended for low-latency environments.
Options include:
•
Enabled (default)
•
Disabled
Advanced Options menu 141