chucklever
commented
8 months ago I've pushed a patch to kdevops to enable UDP on the local test server host. CONFIG_NFS_DISABLE_UDP_SUPPORT needs to be removed from the kernel configuration in order to get the NFS clients to support UDP as well.
We don't yet have a matrix of mount options that can include alternate transports such as UDP or RDMA, so that still needs by-hand set up.
There are still folks who use NFSv3 with UDP, and in fact there was a recent report of a bug introduced by work on the server-side socket transport (to move towards integrating iov_iter_bvec everywhere).
But upstream has stopped testing UDP in our haste to be rid of this unreliable network transport. In the best of all worlds we would still be testing UDP until it has been entirely excised from both the NFS client and server.