Measure DRBD replication performance over TCP/IP

Hello

There are two servers with dedicated DRBD replication link 50 GB/s.

I’m interested in testing DRBD TCP replication performance depending on TCP/IP tuning parameters.

I don’t want to be limited by block devices performance.

So in this case, can I build DRBD on top of /dev/nullb0 ?, created by next command,

modprobe null_blk nr_devices=1