> On Sep 4, 2020, at 12:17 PM, Chuck Lever <chuck.lever@xxxxxxxxxx> wrote: > > > >> On Sep 4, 2020, at 11:24 AM, Bruce Fields <bfields@xxxxxxxxxxxx> wrote: >> >> I'm not seeing the RDMA connection, by the way. SEEK and READ_PLUS >> should work the same over TCP and RDMA. > > The READ_PLUS result is not DDP-eligible because there's no way for > the client to predict in advance whether there will be data (which > can be moved by RDMA), holes or patterns (which cannot), nor how > many of each there might be. > > Therefore I've asked Anna to leave READ_PLUS disabled on RDMA mounts. Since this is a public forum, I should clarify that READ_PLUS does work on NFS/RDMA mounts. It's just not as efficient as NFS READ with RDMA, and that kind of defeats its purpose as a replacement for NFS READ in everyday usage. -- Chuck Lever