lagg and jumbo frames

[bplatt]

I have searched everywhere to find out how to enable jumbo frames on a lagg iface.

It appears that you have to set the mtu on each interface before the lagg is created. Various resources direct to editing Advanced->rc.local and adding values there which I cannot find anywhere.

freenas# find / -iname 'rc.conf'
/etc/defaults/rc.conf
/etc/rc.conf
/conf/base/etc/defaults/rc.conf
/conf/base/etc/rc.conf

I edited both
/conf/base/etc/defaults/rc.conf
/conf/base/etc/rc.conf


and added (for 4 port startech card):

ifconfig_re0="mtu 9000"
ifconfig_re1="mtu 9000"
ifconfig_re2="mtu 9000"
ifconfig_re3="mtu 9000"

neither changes anything:

freenas# ifconfig re0
re0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
options=389b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC>
ether 00:e0:4c:68:be:88
media: Ethernet autoselect (1000baseT <full-duplex>)
status: active


Everything else works and was a breeze to setup, but I am stuck as to how to enable jumbo frames on the freenas lagg0.

 

[James]

You won't find Advanced -> rc.local on FreeNAS 8.0.x as it is available on .7.x systems.

However, if you search for "mtu" at http://doc.freenas.org/index.php/Main_Page the results will show that it can be set as an option at both the interface and the lagg level.

 

[bplatt]

I have already tried settign on both the physical interfaces and the lagg. From the gui, no errors happen, but ifconfig still says mtu 1500. When I try to set the mtu from the cli, I get but only for mtu grater than 1504:

ifconfig: ioctl (set mtu): Invalid argument

Which apprantly means either the nic or the driver doesn't support jumbo frames.

The nic is a 4 port startech ST1000SPEX4 which support jumbo frames. The chipset is Realtek RTL8111C