Multidata transmit (MDT) is available only for systems that run a 64-bit kernel. This feature is new in the Software Express pilot program and in Solaris 9 8/03 release. This feature is included in the Solaris 10 3/05 release.
Multidata transmit enables the network stack to send more than one packet at one time to the network device driver during transmission. Use of this feature reduces the per-packet processing costs by improving the host CPU utilization or network throughput.
The MDT feature is only effective for device drivers that support this feature.
MDT is enabled by default. MDT can be disabled by including the following line in the /etc/system file:
# ndd -set /dev/ip ip_multidata_outbound 0
See also the STREAMS Programming Guide.