linux网络带宽，网速检测

网络带宽检测一般使用iperf

下面的两个连接是linux和PC端工具下载，下载3.1.3就可以了，其他版本试了几个，低版本编译不过，高版本需要交叉编译工具带有openssl库
https://iperf.fr/iperf-download.php
https://downloads.es.net/pub/iperf/

修改编译配置：
https://blog.youkuaiyun.com/u012153439/article/details/79699414

./configure --host=arm --prefix=$(pwd)/…/out/ --host=arm-hisiv300-linux CFLAGS=-static --enable-static LDFLAGS=-static --disable-shared

执行步骤：
服务端:
解压iperf-3.1.3-win64.zip到PC的纯英文目录
WIN+R 打开命令提示符界面，按照如下步骤执行命令

客户端:
把iperf3放到虚拟机下挂载执行
./iperf3 -c PC端的IP

在linux下的检测依据的是/proc/net/dev中的信息
c源码：

/************************************************************************************************
*****Describe: This program is writen to detect the network bite rate                       *****
*****Email: lishuangliang@outlook.com                                                       *****
*****Author: shuang liang li																*****
*****Date: 2018-05-20																		*****
*************************************************************************************************/
#include <sys/types.h>  
#include <sys/stat.h> 
#include <sys/ioctl.h> 
#include <sys/socket.h>
#include <sys/wait.h> 
#include <sys/time.h>
#include <arpa/inet.h>
#include <unistd.h> 
#include <stdio.h>  
#include <stdlib.h>
#include <string.h>  
#include <pthread.h>   
#include <dirent.h> 
#include <time.h>
#include <fcntl.h> 
#include <errno.h>


#ifdef debugprintf
	#define debugpri(mesg, args...) fprintf(stderr, "[NetRate print:%s:%d:] " mesg "\n", __FILE__, __LINE__, ##args) 
#else
	#define debugpri(mesg, args...)
#endif
 
int GetNetRate(FILE* fd,char *interface,long *recv,long *send)
{
	char buf[1024];
	char *p;
	char flow[32];
	int i = 0;	
	char tempstr[16][16]={0};
	
	memset(buf,0,sizeof(buf));
	memset(tempstr,0,sizeof(tempstr));
	fseek(fd, 0, SEEK_SET);
	int nBytes = fread(buf,1, sizeof(buf)-1,fd);
	if (-1 == nBytes)
	{
		debugpri("fread error");
		fclose(fd);
		return -1;
	}
	buf[nBytes] = '\0';
	char* pDev = strstr(buf, interface);
	if (NULL == pDev)
	{
		printf("don't find dev %s\n", interface);
		fclose(fd);
		return -1;
	}
	sscanf(pDev,"%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t%[^' ']\t",\
	tempstr[0],tempstr[1],tempstr[2],tempstr[3],tempstr[4],tempstr[5],tempstr[6],tempstr[7],tempstr[8],tempstr[9],tempstr[10],tempstr[11]);
	//printf("%s\n%s\n%s\n%s\n%s\n",tempstr[0],tempstr[1],tempstr[2],tempstr[9],tempstr[10]);
	*recv = atol(tempstr[1]);		
	*send = atol(tempstr[9]);	
}	 
 int main(int argc, char** argv)  
 {  
	struct timeval tv_now,tv_pre;
	char netdevice[16]={0};
	int nDevLen; 	
	long recvpre = 0,recvcur = 0;
	long sendpre = 0,sendcur = 0;
	double sendrate;
	double recvrate;
	
	if(argc != 2)
	{
		printf("Usage: netrate <network device>\n");
		exit(0);
	}
	
	nDevLen = strlen(argv[1]);
	if (nDevLen < 1 || nDevLen > 10)
	{
		printf("unkown device\n");
		exit(0);
	}
	sprintf(netdevice,"%s",argv[1]);
	FILE* fd = fopen("/proc/net/dev","r+");
	if (NULL == fd)
	{
		debugpri("/proc/net/dev not exists!\n");
		return -1;
	}
	while(1)
	{	
		gettimeofday(&tv_pre,NULL);
		GetNetRate(fd,netdevice,&recvpre,&sendpre);
		sleep(2);
		gettimeofday(&tv_now,NULL);
		GetNetRate(fd,netdevice,&recvcur,&sendcur);
		recvrate= (recvcur - recvpre)/(1024*(tv_now.tv_sec+tv_now.tv_usec*0.000001-tv_pre.tv_sec+tv_pre.tv_usec*0.000001));
		if(recvrate<0)
		{
			recvrate = 0;
		}
		sendrate= (sendcur - sendpre)/(1024*(tv_now.tv_sec+tv_now.tv_usec*0.000001-tv_pre.tv_sec+tv_pre.tv_usec*0.000001));
		if(sendrate<0)
		{
			sendrate = 0;
		}
		system("clear");
		printf("NetWorkRate Statistic Verson 0.0.1\n");
		printf("Net Device	receive rate	send rate\n");
		printf("%-10s\t%-6.2fKB/sec\t%-6.2fKB/sec\n",netdevice,recvrate,recvrate);
	}
	fclose(fd);
	return 0;
 }   
					

Makefile

CC = arm-hisiv300-linux-gcc
all:
	$(CC) netrate.c -D debugprintf  -o netrate	
clean:
	rm -f netrate