CUTE-WRV2.1+TCP core(COM5402)的TCP带宽测试

问题的提出

测试TCP的带宽，硬件平台CUTE-WRV2.1，固件版本WRPCV3.0+COM5402。

代码、工具及实现

1. 在固件中，增加模块，收到TCP数据包后不断地往外发数：

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
use ieee.numeric_std.all;

entity user_tcp_demo is
  port (
    clk_i : in std_logic;
    rst_n_i: in std_logic;

    user_rx_data: in std_logic_vector(7 downto 0);
    user_rx_dvalid:in std_logic;
    user_tx_data: out std_logic_vector(7 downto 0);
    user_tx_dvalid:out std_logic;
    user_tx_cts: in std_logic;
    user_rx_rts: in std_logic
    
  ) ;
end entity ; -- user_tcp_demo

architecture behavioral of user_tcp_demo is

signal user_data:std_logic_vector(7 downto 0);
signal user_dvalid:std_logic;

type t_tx_state is(T_IDLE,T_START,T_DATA,T_WAIT);
signal tx_state : t_tx_state;

begin

user_tx_dvalid <= user_dvalid;
user_tx_data <= user_data;

U_tcp_tx_demo : process( clk_i )
begin
    if rising_edge(clk_i) then
        if rst_n_i = '0' then
            user_dvalid <= '0';
            user_data   <= (others=>'0');
            tx_state <= T_IDLE;            
        else
            case( tx_state ) is
                when T_IDLE =>
                    user_dvalid <= '0';
                    user_data <= (others=>'0');
                    if user_rx_dvalid = '1' then
                        tx_state<= T_START;
                    end if ;
                when T_START =>
                    user_dvalid <= '1';
                    user_data <= user_rx_data;
                    tx_state <= T_DATA;
                when T_DATA =>
                    user_dvalid <= '1';
                    user_data <= user_data + 1;
                    if user_tx_cts = '0' then
                        tx_state<= T_WAIT;
                    end if ;
                when T_WAIT =>
                    user_dvalid <= '0';
                    user_data <= (others=>'0');
                    
                    if user_tx_cts = '1' then
                        tx_state<= T_DATA;
                    end if;

                    if user_rx_dvalid = '1' then
                        tx_state <= T_IDLE;
                    end if ;
                when others =>
                    user_dvalid <= '0';
                    user_data <= (others=>'0');
                    tx_state <= T_IDLE;
            end case ;
        end if ;
    end if ;
end process ; -- U_tcp_tx_demo

end behavioral;

2. PC上使用python脚本主动建立TCP连接，然后接收数据. TCP端口号为8000

# Echo client program
import socket

HOST = '192.168.0.99'    # The remote host
PORT = 8000              # The same port as used by the server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
while True:
  s.sendall(b'Hello, world')
  data = s.recv(1024)
#  print(repr(data))
s.close()

3. PC上使用speedometer或者来记录带宽

sudo speedometer -r eth2 -t eth2
sudo iftop -i eth2

测试结果

PC透过WR交换机和CUTEWR通讯的带宽：

　　Speedometer报告的结果为28.2MB/s

　　iftop报告的结果为220Mb/s