To enable jumbo frames on the nxge interface you need to edit the below file. There is option to enable frames per interface, but this didnt work out for me so I enable on all the interface.
/platform/sun4v/kernel/drv/nxge.conf
#------- Jumbo frame support ---------------------------------
# To enable jumbo support for all nxge interfaces,
accept_jumbo = 1;
#
# To disable jumbo support for all nxge interfaces,
# accept_jumbo = 0;
#
# Default is 0. See the example at the end of this file for
# enabling or disabling jumbo for a particular nxge interface.
#
#
root@husky # dladm show-link
nxge0 type: non-vlan mtu: 9194 device: nxge0
nxge1 type: non-vlan mtu: 9194 device: nxge1
nxge2 type: non-vlan mtu: 9194 device: nxge2
nxge3 type: non-vlan mtu: 9194 device: nxge3
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