[openib-general] Re: [PATCH] change Mellanox SDP workaround to a moduleparameter

[Hal Rosenstock]

On Wed, 2006-02-15 at 19:03, Roland Dreier wrote:
>     mst> I thought about it some more: what happens if nodes with
>     mst> different max MTU values try to connect?
> 
> This should never happen.  The SM should never give a path with an MTU
> that is not supported by both end nodes.

True, but the description for the CM REJ code 26 for Invalid Path MTU
states something a little different (p. 667):

"The recepient of the REQ message cannot support the maximum packet
payload size requested."

is being interpreted as "prefers not to support the max payload size
requested" which is probably OK.

> I guess the question is what to do when a Tavor (with the performance
> bug that makes a 1K MTU faster) connects to someone else.

Isn't it the other way 'round (when something with a larger MTU connects
to Tavor) ?

-- Hal

>  - R.
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