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Found by code comparison, let's add the modest performance gain reported by Chuck:
https://lore.kernel.org/linux-nfs/20181001181414.2305.94635.stgit@klimt.1015granger.net/

This work landed upstream in v4.20, seems our maintenance has missed adding these so far.

3ae2cefb613b svcrdma: Increase the default connection credit limit
07880fa4968b svcrdma: Remove try_module_get from backchannel
596f2a195043 svcrdma: Remove ->release_rqst call in bc reply handler
f3c1fd0ee294 svcrdma: Reduce max_send_sges

Patch(es) available on kernel-4.18.0-157.el8

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:1769