Yesterday I tried adding
to our /etc/modprobe.d/lnet.conf for our all IB-connected Lustre 1.8 clients and servers. The motivation for wanting to try it came from section VI of this CUG12 paper:
I'm not sure what to make of the above - are the values of peer_credits and concurrent_sends that I tried to use too large? Are there other parameters which one must change in order to set o2iblnd peer_credits and/or concurrent_sends?