Stupid question, but isn't 10Gbe a lot faster with e.g. 9000 byte MTU? I thought I saw in the original post, a 1500 byte MTU:
From original post:
e1a: flags=0x5f4e867<UP,BROADCAST, RUNNING,MULTICAST,TCPCKSUM,NOWINS> mtu 1500
if the 1500 byte MTU can be changed to 9000 without interrupting service (depends on switch and other configuration, most likely), you might see a speed bump.
Cheers
Patrick