[Ovirt-devel] Jumbo frame support on nodes

[Justin Clacherty]

  On 20/09/2010 10:52 PM, Daniel P. Berrange wrote:
>
> When setting up jumbo frames using bridging you need to several things
>
>   - Set MTU on the physical NIC
>   - Set MTU on the bridge
>   - Set MTU on the TAP devices
>
> you must do the first two before the bridge is brought online. when libvirt
> creates a TAP device for a guest, it will automatically copy the MTU of
> the bridge to the TAP device. So if ovirt is configuring the physical NIC
> and bridge with a suitably large MTU, the libvirt bit will 'just work'.

Ok.  So what's needed for this is the ability to set the MTU size in the 
user interface and for that to be sent on to the host when it's network 
is configured at boot.  Would this be best done when editing the network 
on a particular host, when adding networks in the network section of the 
user interface, or in both places?

Once that's done, the MTU size needs to be sent to the node at boot time 
with the other network settings and the node needs to create it's 
devices with the specified MTU.

Justin.