[lustre-discuss] 'queue depth too large', but connection works

Thomas Roth t.roth at gsi.de
Sat Jan 29 09:46:45 PST 2022

Dear all,

test system: servers 2.12.7, and a client 2.12.6., all mlx4.

The client has some non-default ko2iblnd parameters, including "peer_credits=16".

I mounted my test system there and happily copied around some directories. Only afterwards I found
 > LNetError: 5278:0:(o2iblnd_cb.c:2551:kiblnd_passive_connect()) Can't accept conn from at o2ib6, queue depth too large:  16 (<=8 wanted)
in the MDS log.

I did read LU-3322, but obviously did not the point. "Can't accept conn" used to deny client access, but the MDS that didn't like my client just 
created some ~25k new objects on behalf of that client.

Does this mean client and server negotiate a suitable value, but behind the scenes?


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