[ofa-general] Setting mtu on an IB port

[Hal Rosenstock]

On Thu, Jun 11, 2009 at 4:58 AM, Tziporet
Koren<tziporet at dev.mellanox.co.il> wrote:
> Pradeep Satyanarayana wrote:
>>
>> Sean, You are right about the IB MTU. My guess was that he was trying to
>> set both
>> (based on the 2044 in his mail).
>>
>> I use the embedded SM rather than openSM. Hence guidance on that will be
>> helpful.
>>
>>
>
> If you are using ConnectX and OFED 1.4.1 we added a module parameter to work
> with 4K mtu:
>
>  set_4k_mtu:          attempt to set 4K MTU to all ConnectX ports (default
> 0)
>
> All the InfiniHost devices support only 2K MTU
>
> Regarding the switches: Infiniscale IV supports 4K MTU by defualt
>
> You also need to configure OpenSM to support 4K MTU - but someone from
> management people should answer this

Nothing needs to be done to OpenSM. OpenSM uses the largest MTU common
to the peers at the end of the links so this depends on the MTUCap
advertised by the devices.

-- Hal

> Tziporet
>
>
>
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