[ 第一个arm板到第二个arm板传输有问题很卡，arm板是Linux系统，tinny6410的板子。程序如下：服务器端（arm1）

复制代码 #include <stdio.h>//server program #include <stdlib.h>//第一个arm板服务器端代码 #include <string.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h> #include <stddef.h> #include <unistd.h> #include <pthread.h> #include <fcntl.h> #include <io.h> #include <sys/stat.h> #include <unistd.h> #include <linux/tcp.h> #define SERVER_PORT 7777 #define LISTEN_QUEUE_LENGTH 20 #define BUFFER_SIZE 1024 #define MAX_THREAD_NUM 100 #define HOST_ADDR "202.207.25.53" int thread_count = 0; pthread_t threads[MAX_THREAD_NUM]; int static cout=1; int client_conn; int flag=0,tmp_sock; int pthread_err; fd_set rfd_set,wfd_set; struct timeval timeout={2,0}; pthread_attr_t attr,attr1;      struct sched_param param,param1;     // long newprio_send=108400000,newprio_net=1083; /** * 艙脫脢脮脢媒鸥脻碌脛脰沤脨脨潞炉脢媒 * @param conn_socket */ void recv_data(int conn_socket); /* * 脰梅路艙路拧 */ int main(int argc, char** argv) {     // 艙拧脕垄Socket int ret;     int server_socket = socket(PF_INET, SOCK_STREAM, 0);     if (server_socket < 0) {         printf("Socket create failed.\n");         return EXIT_FAILURE;     }     {         int opt = 1;         setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof (opt));     }     // 脡猫脰脙路镁脦帽脝梅露脣艗脿脤媒脤脳艙脫脳脰虏脦脢媒     struct sockaddr_in server_addr;     bzero(&server_addr, sizeof (server_addr));     server_addr.sin_family = AF_INET;     server_addr.sin_addr.s_addr = inet_addr(HOST_ADDR);     server_addr.sin_port = htons(SERVER_PORT);     // 掳贸露拧露脣驴脷     if (bind(server_socket, (struct sockaddr*) &server_addr, sizeof (server_addr)))     {         printf("Bind port %d failed.\n", SERVER_PORT);         return EXIT_FAILURE;     }          // 驴陋脢艗艗脿脤媒     if (listen(server_socket, LISTEN_QUEUE_LENGTH))     {          printf("Server Listen Failed!");          return EXIT_FAILURE;     } fcntl(server_socket,F_SETFD,O_NONBLOCK);          // 驴陋脢艗沤艩脌铆驴脥禄搂露脣脕卢艙脫     bzero(&threads, sizeof(pthread_t) * MAX_THREAD_NUM);     int opt = 1,sok;   setsockopt(server_socket, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof (opt)); sok=setsockopt(server_socket, IPPROTO_TCP,TCP_NODELAY,(char*)&opt, sizeof (opt)); if(sok==-1){printf("Can't seting!");} while (1)     {         struct sockaddr_in client_addr;         socklen_t length = sizeof(client_addr);         FD_ZERO(&rfd_set);         FD_SET(server_socket,&rfd_set);                 // 艙拧脕垄驴脥禄搂露脣脕卢艙脫     ret=select(server_socket+1,&rfd_set,NULL,NULL,&timeout);        if(ret==0){continue;}        if(FD_ISSET(server_socket,&rfd_set))     { int client_conn = accept(server_socket, (struct sockaddr*) &client_addr, &length);         if (client_conn < 0)         {             printf("Server Accept Failed!\n");             return EXIT_FAILURE;         }                  // 脨脗艙拧脧脽鲁脤, 脢鹿脫脙脨脗脧脽鲁脤脫毛驴脥禄搂露脣艙禄禄楼 pthread_attr_init(&attr);   pthread_attr_setschedpolicy(&attr,SCHED_RR); if(flag==0){tmp_sock=client_conn;flag=1;} else{ //param.sched_priority=newprio_net; //pthread_attr_setschedparam(&attr, &param);       pthread_create(threads + (thread_count++), NULL, (void *)recv_data, (void *)client_conn);}         if (pthread_err != 0)         {             printf("Create thread Failed!\n");             return EXIT_FAILURE;         }              } }     close(server_socket);     return (EXIT_SUCCESS); } void recv_data(int conn_socket) {           char buffer[BUFFER_SIZE];     bzero(buffer, BUFFER_SIZE);     int  length = 0,tmp=0;     while (length = recv(conn_socket, buffer, BUFFER_SIZE, 0))     {         if (length < 0)         {             printf("Server Recieve Data Failed! code %d\n", length);         }tmp+=length;          write(tmp_sock,buffer,length);                  printf("time=%d\t length=%d\t the buffer is: %s\n ", cout,tmp,buffer);          cout++;         bzero(buffer, BUFFER_SIZE);     }     close(conn_socket); }

[code][
#include <stdio.h>、、第二个ARM板的客户端程序
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include <unistd.h>
#include <pthread.h>
#include <fcntl.h>
#include <io.h>
#include <sys/stat.h>
#include <unistd.h>
#define    MAXBUFFSIZE    1024
#define    PORT 7777

#define HOST_ADDR "202.207.25.53"


int fd_net_syn;
int main(int argc, char *argv[])
{
    int tmp_socket;
if((fd_net_syn=open("send_synew",O_CREAT|O_TRUNC|O_RDWR))==-1)

{
        printf("Can't open the file:send.txt\n");
    }        


        int sockfd,n;
    char recvbuff[MAXBUFFSIZE];
    struct sockaddr_in    servaddr;
    sockfd=socket(AF_INET,SOCK_STREAM,0);
    if(sockfd<0)
    {
        printf("Socket created failed.\n");
        return -1;
    }    
    
    servaddr.sin_family=AF_INET;
    servaddr.sin_port=htons(PORT);
    servaddr.sin_addr.s_addr=inet_addr(HOST_ADDR);
    printf(" connecting...\n");
    if(connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr))<0)
    {
        printf("Connect server failed.\n");
        return -1;
    }
else     {printf(" Connect server success.\n");}
    


while(1)
    {
           n=read(sockfd,recvbuff,MAXBUFFSIZE);
            if(n>0)
        {
write(fd_net_syn,recvbuff,n);
printf("the receive data is:%s\nthe byte=%d\n",recvbuff,n);}
    }
  
    return 0;
}


code]这样传输后，第一个arm板到第二个arm板传输文件就非常的慢，不知道为什么？

是有点卡，还好，我遇到的问题是，两块arm通过路由器相连，arm之间只能一端向另一端通信，反过来就会很慢，如果发送了东西然后再发送又变得很快了。单方向传输还是没多少问题。但是两块arm板直接用网线连接又很快，pc和arm通过路由又很快。所以，你这个问题估计不是程序的问题。

谢谢nankon的回复，确实如你所说，pc传ARM板很快，ARM传ARM很慢。我一直在寻求一种方案可以解决这个问题，现在初步发现ARM板开一个TCP连接传输就会很快，必须彻底关掉PC传输ARM的TCP端口（用shutdown（）函数），再建立ARM板间的TCP这样的传输才稍快一些。但是效果还是不理想，希望能够做成pc接ARM接pc那样的传输速度！