Enabling Jumbo Frames on nxge interface

Asset ID:	1-71-1470729.1
Update Date:	2012-09-19
Keywords:

Solution Type Technical Instruction Sure

Solution 1470729.1 : Enabling Jumbo Frames on nxge interface

Applies to:

Sun SPARC Enterprise M5000 Server - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Goal

How to enable jumbo frame for a particular instance of nxge interface ?

Fix

For eg, we will take nxge0.

To enable jumbo frame on nxge0, you will need to use nxge.conf file . But that will need reboot.
It is not possible to set jumbo frames without reboot.

Below is how you configure it using /kernel/drv/nxge.conf file:

# grep -i nxge /etc/driver_aliases
nxge "pciex108e,abcd"
nxge "SUNW,niusl"
nxge "SUNW,rock-pciex108e,abcd"
nxge "SUNW,niusl-kt"

# grep -i nxge /etc/path_to_inst
"/pci@500/pci@0/pci@8/network@0" 0 "nxge"
"/pci@500/pci@0/pci@8/network@0,1" 1 "nxge"
"/pci@500/pci@0/pci@8/network@0,2" 2 "nxge"
"/pci@500/pci@0/pci@8/network@0,3" 3 "nxge"

Please, put below line in /kernel/drv/nxge.conf for nxge0:

name = "pciex108e,abcd" parent = "/pci@500/pci@0/pci@8" unit-address = "0" accept-jumbo=1;

Please, put below line in /kernel/drv/nxge.conf for nxge1:

name = "pciex108e,abcd" parent = "/pci@500/pci@0/pci@8" unit-address = "0,1" accept-jumbo=1;

Also, change /etc/hostname.nxge0 and /etc/hostname.nxge1 as below:
/etc/hostname.nxge0
<ip address> mtu 9194

/etc/hostname.nxge1
<ip address> mtu 9194

Then reboot will be needed.
ifconfig -a should confirm mtu set to 9194 instead of 1500 for nxge0 and nxge1.

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