If your keen on enabling jumbo frames in opensolaris this is the way…
http://docs.sun.com/app/docs/doc/819-6990/gdyqk?l=en&a=view
# dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE
net0 ether up 100Mb full bge0
itops1 ether up 100Mb full qfe3
web1 ether up 100Mb full bge1
# dladm show-linkprop -p mtu web1
LINK PROPERTY VALUE DEFAULT POSSIBLE
web1 mtu 1500 1500 —
# ifconfig web1 unplumb
# dladm set-linkprop -p mtu=9000 web1
# ifconfig web1 plumb 10.10.1.2/24 up
# dladm show-link web1
LINK CLASS MTU STATE OVER
web1 phys 9000 up —
dladm show-phys
LINK MEDIA STATE SPEED DUPLEX DEVICE
net0 ether up 100Mb full bge0
itops1 ether up 100Mb full qfe3
web1 ether up 100Mb full bge1
dladm show-linkprop -p mtu web1
LINK PROPERTY VALUE DEFAULT POSSIBLE
web1 mtu 1500 1500 —
ifconfig web1 unplumb
dladm set-linkprop -p mtu=9000 web1
ifconfig web1 plumb 10.10.1.2/24 up
dladm show-link web1
LINK CLASS MTU STATE OVER
web1 phys 9000 up —
Done.
Note: this is not something that i would recommend or currently use. I prefer trunking two nics to give additional performance. https://sigtar.com/2009/07/20/opensolaris-network-teaming/