[libfabric-users] memory registration "not needed", with the efa provider?

[Titus, Greg]

Greetings --

I'm trying to use the efa provider on an AWS instance that has the Elastic Fabric Adaptor high-performance network interface.  In the fi_efa(7) man page for libfabric version 1.9.0amzn1.1 installed on the system it says:
The RDM endpoint does not require memory registration

I was a little in disbelief when I read that, and thus was not surprised when I tried simply not making any memory registration calls and sure enough, got internal errors in libfabric.  So, what does that statement in the man page mean, exactly?   Is there maybe a magic remote key value that means "I didn't register memory."?  I'm just using 0UL, in the absence of any other guidance.

thanks,
greg

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