Change MTU for Solaris on e1000g interface

I have Linux and OpenSolaris installed on Virtualbox with Intel Pro/1000 network interface, Changing MTU on Linux worked fine but it failed on Solaris

$ifconfig e1000g1 mtu 9000
ifconfig: setifmtu: SIOCSLIFMTU: e1000g1: Invalid argument

It turns out that Solaris's driver doesn't have jumbo frame enabled by default, you have to enable it manually. Following enables jumbo frame on e1000g1 only.

$/kernel/drv/e1000g.conf 
MaxFrameSize=0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
        # 0 is for normal ethernet frames.
        # 1 is for upto 4k size frames.
        # 2 is for upto 8k size frames.
        # 3 is for upto 16k size frames.
        # These are maximum frame limits, not the actual ethernet frame
        # size. Your actual ethernet frame size would be determined by
        # protocol stack configuration (please refer to ndd command man pages)
        # For Jumbo Frame Support (9k ethernet packet)
        # use 3 (upto 16k size frames)

Now set MTU to 9000 instead of 16K by editing file hostname.e1000g1. hostname.e1000g1 is interface configuration file, the first entry is your ip address or a name, the name must be resolvable in /etc/hosts.

$/etc/hostname.e1000g1
ip/name mtu 9000

#shutdown -i6 to reboot to take effect.

dladm is supposed to be the new method, But it didn't work.

#dladm show-linkprop -p mtu e1000g1
LINK         PROPERTY        PERM VALUE          DEFAULT        POSSIBLE
e1000g1      mtu             rw   16298          1500           -- 
#dladm set-linkprop -p mtu=9000  e1000g1
dladm: warning: cannot set link property 'mtu' on 'e1000g1': try again later