Intel® I/O Acceleration Technology (Intel® I/OAT) accelerates TCP/IP processing and reduces CPU overhead. It scales up to eight GbE and 10 10GbE ports and supported on dual- or quad-core Xeon architecture.
Supported by Solaris beginning s11b89.
From b89 ON:
6567008 driver for intel ioat v1 & v2 DMA engine needed
6582323 uioa – uio asynchronous, for support of Intel I/OAT hardware
6582330 sodirect – socket direct, for support of Intel I/OAT hardware
6582335 TCP/IP receive-side zero CPU copy for support of Intel I/OAT hardware
Some bugs were fixed in b91: