[Samba] SMB Direct support?

Jeremy Allison jra at samba.org
Wed Jul 31 18:39:54 UTC 2019

On Wed, Jul 31, 2019 at 11:02:18AM +0000, douxevip via samba wrote:
> Hi all, is there anybody on the mailing list who is more knowledgeable about SMB direct? Would appreciate some pointers. See below. Thanks.
> -------- Original Message --------
> On Jul 25, 2019, 22:52, douxevip via samba < samba at lists.samba.org> wrote:
> Hello all, I was reading up on SMB Direct support and it seems very interesting. I looked through slides of a presentation by Stefan Metzmacher about SMB Direct last year:
> https://www.samba.org/~metze/presentations/2018/SDC/StefanMetzmacher_SDC2018-SMB-Direct-Status-rev1-presentation.pdf
> I was wondering what the current support of of SMB Direct for Samba.
> I have a Windows 10 Pro for Workstations machine that supports SMB Direct natively and I also have 2 Mellanox ConnectX-3 dual SFP+ cards (one in the Windows machine, one in a local server) that both support RDMA and RoCE (RDMA Over Converged Ethernet). These systems are connected with a 10G SFP+ switch and fiber optic cables. iperf3 performance tests max out the connections, and I have enabled jumbo frames (MTU 9000).
> The server is currently running Debian 10 with kernel 5.0.15, with Samba version 4.9.5. I have only SMB3 enabled in the smb.conf and I want to try out SMB Direct and see how much it improves performance in our local network.
> Is it possible to get SMB Direct working already? If so, what steps are required? And if not, how far away are we from this feature? It seems like a massive performance boost, and with 10G cards, switches and cables becoming more affordable, it's a very interesting prospects from small businesses.
> All help would be greatly appreciated.

Metze and Richard Sharpe are the go-to people on this,
but both are quite busy right now.

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