请教大神如何提高RTT+LWIP的速率呢

用BSP里的STM32F107例子，增加TCPECHO线程并挂接netio进行测试；

netio的测试结果如下：

D:iperf-2.0.5>win32-i386 -t 192.168.8.45
NETIO - Network Throughput Benchmark, Version 1.26
(C) 1997-2005 Kai Uwe Rommel
TCP connection established.
Packet size 1k bytes: 1097 KByte/s Tx, 4304 Byte/s Rx.
Packet size 2k bytes: 1094 KByte/s Tx, 488 KByte/s Rx.
Packet size 4k bytes: 1102 KByte/s Tx, 916 KByte/s Rx.
Packet size 8k bytes: 1100 KByte/s Tx, 864 KByte/s Rx.
Packet size 16k bytes: 1102 KByte/s Tx, 904 KByte/s Rx.
Packet size 32k bytes: 1104 KByte/s Tx, 896 KByte/s Rx.
Done.

TCPECHO使用ipref进行测试，结果如下：

D:iperf-2.0.5>iperf -c 192.168.8.45 --port 8000
------------------------------------------------------------
Client connecting to 192.168.8.45, TCP port 8000
TCP window size: 64.0 KByte (default)
------------------------------------------------------------
[ 3] local 192.168.8.161 port 1700 connected with 192.168.8.45 port 8000
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-25.0 sec 192 KBytes 63.0 Kbits/sec

TCPECHO的测试代码如下：

char buf[1024];
void rt_tcp_echo_thread_entry(void *parameter)
{
  int ret=0;
  int local_socket,echo_socket;
    struct sockaddr_in  echo_addr,from;
  socklen_t   addr_len = sizeof(struct sockaddr_in);
  echo_addr.sin_family = AF_INET;
    echo_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    echo_addr.sin_port = htons(8000);
  rt_kprintf("Creat Echo socket thread start!
");
  while(1)
  {
    local_socket = socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);
    if(INVALID_SOCKET == local_socket)
    {
      rt_kprintf("Creat Echo socket failed!
");
      rt_thread_delay(100);
      continue;
    }
    ret = bind(local_socket,(struct sockaddr*)&echo_addr, addr_len)  ;
    if (SOCKET_ERROR == ret)
      {
          closesocket(local_socket);
          echo_socket = INVALID_SOCKET;
          rt_kprintf("local_socket bind port failed with %d
",ret);
          rt_thread_delay(100);
      continue ;
      }
    ret = listen(local_socket,5);
    if (SOCKET_ERROR == ret)
      {
          closesocket(local_socket);
          echo_socket = INVALID_SOCKET;
          rt_kprintf("local_socket listen port failed with %d
",ret);
          rt_thread_delay(100);
      continue ;
      }
    while(1)
    {
      echo_socket = accept(local_socket,(struct sockaddr*)&from,&addr_len);
      if(INVALID_SOCKET == echo_socket)
      {
        rt_thread_delay(100);
        continue;
      }
      while(1)
      {
        ret=recv(echo_socket, buf, sizeof(buf), 0);
        if(ret > 0)
        {
          send(echo_socket,buf,ret,0);
        }
        else
        {
          closesocket(echo_socket);
          break;
        }
      }
    }
  }
}

线程挂载部分：

  echo_thread = rt_thread_create("tcpecho",
                                   rt_tcp_echo_thread_entry, RT_NULL,
                                   2048, 3, 1);
  if(RT_NULL == echo_thread)
  {
    rt_kprintf("creat tcp echo failed
");
  }
  else
  {
    rt_thread_startup(echo_thread);
  }

与我之前测试的另外一块芯片，没有用操作系统，相比之下，差距太大了。



请问要想提高速率，该从哪些方面下手？ 谢谢。