Question

http://www.boost.org/doc/libs/1_45_0/doc/html/boost_asio/example/echo/async_udp_echo_server.cpp”rel=“noreferer”

{   

ctr++;
cout<<"Counter: "<<ctr<<" data= "<<data<<endl;

socket_.async_receive_from(boost::asio::buffer(data_, max_length), sender_endpoint_,boost::bind(&server::handle_receive_from, this,boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));

}

意图是每当处理民盟的连接时,基本上增加反面。

测试客户正在发送此类数据。

for(;;){
ctr++;
printf("ctr= %lu
",ctr);
snprintf(buf2, 10,"%lu",ctr);
if ((numbytes = sendto(sockfd, buf2, strlen(buf2), 0,p->ai_addr, p->ai_addrlen)) == -1)   
{
perror("client: sendto");
exit(1);
}
}

在管理测试客户之后,我看到服务器方面:

Counter= 358239 data= 369880

the data part shows the message #. The test client has indeed sent 369880 messages but as you can see counter is only 358239 (drop of 11641 messages).

这里可能有什么错误?

Both hosts (sender and receiver, running Ubuntu 10.04 LTS) are okay with resources- I don t see CPU, memory or network saturating.

<代码>netstat-su的输出情况类似

Udp:
    38569571 packets received
    1003583 packets to unknown port received.
    74619 packet receive errors
    267 packets sent
    RcvbufErrors: 74619

How do I troubleshoot large number of packets to unknown port received ?

Answer 1

考虑到你正在基本上进行接收界面的“饱和轰炸”,我期望,除了没有保证科索沃民主党将提供数据,而且你还可能破坏你的网络卡。广泛例如,卡片的发送量非常小,而且得到缓冲,因此,打碎这些卡可能是有益的。我建议使用<代码>netstat-anc egrep“Recv >lt;port number>。并且看到接受缓冲的面积在接收结束时。

如果你饱和缓冲,你将开始放弃包装。

As far as packets to unknown port you would need to do a tcpdump and analyze the output using WireShark or a similar tool to see what UDP traffic you are receiving in that category.

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