2.13. Reducing the TCP delayed ack timeout

Some applications that send small network packets can experience latencies due to the TCP delayed acknowledgement timeout. This value defaults to 40ms. To avoid this problem, try reducing the tcp_delack_min timeout value. This changes the minimum time to delay before sending an acknowledgement systemwide.
  1. Write the desired minimum value, in microseconds, to /proc/sys/net/ipv4/tcp_delack_min:
    # echo 1 > /proc/sys/net/ipv4/tcp_delack_min