This networking enhancement is new in the Solaris 10 6/06 release.
Performance of both the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) has been enhanced in this release. The enhancements result in lower latency and higher throughput for both transmit performance and receive performance. Network applications yield better performance due to system performance improvements. This feature particularly benefits applications that heavily transmit and receive UDP packets or use TCP loopback connections.