RE: Question regarding protocol specific mtu for FCoE

Zou, Yi
2009-06-03T20:43:14Z

>On Wed, 2009-06-03 at 12:16 -0700, Zou, Yi wrote:
>[...]
>> FCoE is on L2 layer, no path specific MTU, everything goes out as
>> whatever mtu known to the nic. Since the nic is expected to be used
>for
>> converged traffic involving multiple traffic types, e.g. LAN, FCoE, I
>> was wondering if it makes sense to have the additional MTU.
>Essentially,
>> the nic driver will be able to setup via netdev for different MTUs
>for
>> converged traffic.
>
>Wouldn't you use separate VLANs for FCoE and other traffic? So maybe
>we
>should allow for per-VLAN rather than per-protocol MTU.
>
>Ben.
>
>From what I can tell, you will not be able to set vlan device's MTU
that is larger than the real_dev->mtu, as in vlan_dev_change_mtu().

Thanks.

yi