David Dillow wrote:

It looks like I can only have up to 256 keys for each fast page 
registration MR, so that seems to limit the mappings in flight

My understanding is that for --specific-- MR, its associated rkey would 
wrap every 256 mappings see ib_update_fast_reg_key and friends. And 
anyway, for specific MR you can have only one mapping living at any 
point of time (e.g set before sending the request, invalidated remotely 
with the response or locally after getting the response)

Or.

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