Fab Tillier wrote:
Ok, so this question is from a noob, but here goes anyway. Why can't IPoIB
advertise a larger MTU than the UD MTU, and then just fragment large IP
packets up if they need to go over the IB UD transport? Is there any reason
this couldn't work? If it does, it allows IPoIB to expose a single MTU to
the OS, and take care of the rest under the covers.
Just a thought.
I don't remember seeing a response to this. Something like this could work.
I guess one disadvantage is that it can be less efficient if you lose a
lot of packets. TCP would resend an entire MTU (as seen by TCP) of data if
only a single IB packet were lost.
- Sean
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