I'm trying to maximize the NFS/TCP bandwidth between a Linux client and a single NFS server over a 10Gbps link. Although each NFS mount has its own device (major/minor), everything comes down to a single TCP connection and this is a bottleneck.
Using iperf and multiple TCP connections, I can reach ~8Gbps, but NFS is stuck on a single TCP stream and limited to ~2Gbps (no tcp tuning yet).
On Solaris, there's the system setting
rpcmod:clnt_max_conns which allow to set how many concurrent TCP connection the system is able to use to a single NFS server.
Is there a Linux equivalent or a way to do so ?
As a workaround, I know I could set many IP on the NFS server, and then load-balance the mountpoints on them but that wouldn't be optimal.