blocks|key|1556521|text|在传输数据之前，每个TCP连接都需要初始握手。此外，TCP报头包含用于不同信号和消息传递检测的大量开销。对于消息交换，如果失败的可能性很小，UDP可能就足够了。如果必须验证接收，则TCP是您的最佳选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1556522|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Each TCP connection requires an initial handshake before data is transmitted. Also, the TCP header contains a lot of overhead intended for different signals and message delivery detection. For a message exchange, UDP will probably suffice if a small chance of failure is acceptable. If receipt must be verified, TCP is your best option.

blocks|key|1556580|text|UDP比TCP更快，原因很简单，因为它不存在允许连续数据包流的确认数据包(ACK)，而不是使用TCP窗口大小和往返时间(RTT)计算出的确认一组数据包的TCP。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1556581|有关更多信息，我推荐使用简单但非常容易理解的Skullbox+explanation+(TCP+vs.+UDP)|offset|length|1556582|entityMap|0|LINK|mutability|MUTABLE|url|http://www.skullbox.net/tcpudp.php^0|0|M|Y|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@$D|P|E|Q|1|R]]|A|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|M]]]]

UDP is faster than TCP, and the simple reason is because its non-existent acknowledge packet (ACK) that permits a continuous packet stream, instead of TCP that acknowledges a set of packets, calculated by using the TCP window size and round-trip time (RTT).

For more information, I recommend the simple, but very comprehensible <a href="http://www.skullbox.net/tcpudp.php" rel="noreferrer">Skullbox explanation (TCP vs. UDP)</a>

blocks|key|1556639|text|请记住，TCP通常会在网络上保存多个消息。如果你想在UDP中实现它，如果你想可靠地实现它，你会有相当多的工作要做。你的解决方案要么不太可靠，要么速度更慢，要么工作量大得惊人。有一些有效的UDP应用程序，但是如果你问这个问题，你的应用程序可能不是。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1556640|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Keep in mind that TCP usually keeps multiple messages on wire. If you want to implement this in UDP you'll have quite a lot of work if you want to do it reliably. Your solution is either going to be less reliable, less fast or an incredible amount of work. There are valid applications of UDP, but if you're asking this question yours probably is not.

blocks|key|1771855|text|如果你需要在两个还没有说话的IP之间快速发送一条消息，那么UDP到达的速度至少会快3倍，通常是5倍。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1771856|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you need to quickly blast a message across the net between two IP's that haven't even talked yet, then a UDP is going to arrive at least 3 times faster, usually 5 times faster.

blocks|key|1556759|text|哪种协议的性能更好(就吞吐量而言)-+UDP或TCP+-实际上取决于网络特征和网络流量。例如，Robert+S.Barnes指出了TCP执行得更好的一种场景(小型写入)。现在，考虑网络拥塞并且同时具有TCP和UDP流量的场景。网络中使用TCP的发送方将感知到“拥塞”并降低其发送速率。然而，UDP没有任何拥塞避免或拥塞控制机制，并且使用UDP的发送者将继续以相同的速率注入数据。逐渐地，TCP发送者将其发送速率降低到最低，如果UDP发送者有足够的数据通过网络发送，它们将占用大部分可用带宽。因此，在这种情况下，UDP发送者将拥有更大的吞吐量，因为它们获得了网络带宽的更大蛋糕。事实上，这是一个活跃的研究课题-如何在存在UDP流量的情况下提高TCP吞吐量。据我所知，TCP应用程序可以通过打开多个TCP连接来提高吞吐量。这样，即使每个TCP连接的吞吐量可能有限，所有TCP连接的吞吐量总和也可能大于使用UDP的应用程序的吞吐量。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1556760|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Which protocol performs better (in terms of throughput) - UDP or TCP - really depends on the network characteristics and the network traffic. Robert S. Barnes, for example, points out a scenario where TCP performs better (small-sized writes). Now, consider a scenario in which the network is congested and has both TCP and UDP traffic. Senders in the network that are using TCP, will sense the 'congestion' and cut down on their sending rates. However, UDP doesn't have any congestion avoidance or congestion control mechanisms, and senders using UDP would continue to pump in data at the same rate. Gradually, TCP senders would reduce their sending rates to bare minimum and if UDP senders have enough data to be sent over the network, they would hog up the majority of bandwidth available. So, in such a case, UDP senders will have greater throughput, as they get the bigger pie of the network bandwidth. In fact, this is an active research topic - How to improve TCP throughput in presence of UDP traffic. One way, that I know of, using which TCP applications can improve throughput is by opening multiple TCP connections. That way, even though, each TCP connection's throughput might be limited, the sum total of the throughput of all TCP connections may be greater than the throughput for an application using UDP.

blocks|key|1771996|text|如果不考虑网络条件，谈论TCP或UDP是没有意义的。如果两点之间的网络质量非常高，UDP绝对比TCP快，但在其他一些情况下，如GPRS网络，TCP可能比UDP更快、更可靠。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1771997|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

It is meaningless to talk about TCP or UDP without taking the network condition into account.
If the network between the two point have a very high quality, UDP is absolutely faster than TCP, but in some other case such as the GPRS network, TCP may been faster and more reliability than UDP.

For general protocol message exchange, which can tolerate some packet loss. How much more efficient is UDP over TCP?

UDP vs TCP, how much faster is it?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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用于通用协议消息交换，它可以容忍一些分组丢失。UDP在TCP上的效率要高多少？

问UDP与TCP相比，它快了多少？
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