Turn on TCP_NODELAY on the remote socket, to turn off sender silly window

Turn on TCP_NODELAY on the remote socket, to turn off sender silly window
 syndrome avoidance.  The combination of SWS avoidance and ack-every-other
 causes low throughput if the block size divided by the MSS is odd (which
 is true with the default block size and MSS).
Turning on TCP_NODELAY disables the Nagle algorithm and sender SWS avoidance.
 The rdump request/response protocol can not invoke Nagle and cannot cause
 SWS, so this has no negative effects.