|  /* set IP_TOS to request bulk-type packet queuing */
|  tos = IPTOS_THROUGHPUT;
|  if (setsockopt(fd, IPPROTO_IP, IP_TOS, (char *) &tos, sizeof(tos)) < 0)
|  {
|	  syslog(LOG_ERR, "setsockopt IPTOS_THROUGHPUT on fails: %m");
|  }

Just how will this help? The master controller will still have to
buffer the TCP packets until they all arrive in-order because they
are part of one tcp connetion.

Changing the TOS in the middle of the TCP connection is not going to
help you.

The constraint is that there is only one tcp connetion.

--jhawk