Last Updated: 2023-03-27 09:34:57 Monday
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这个世界90%的流量都使用TCP承载，TCP已经成为当今互联网的速度瓶颈。
Transmission Control Protocol (TCP) was developed nearly four decades ago when the primary users of the Internet were DARPA and universities. Despite being used to deliver more than 90% of all Internet traffic, TCP has actually become a key bottleneck to today’s fast web performance.
IP层是不可靠的， TCP是一个工作在传输层的可靠数据传输的协议，它能确保接收端接收的网络包是无损坏、无间隔、非冗余和按序。
看到有人说，TCP其实是一个tunnel，抽象出了一个byte stream。
The one problem with TCP is that when a lost packet is detected at a receiver, the sender needs to retransmit it. This takes time to happen and can mean that the byte stream reconstruction gets delayed. This is known as
TCP head-of-line blocking. Applications regularly use TCP via a socket API that abstracts away protocol details; they often can't tell if there are delays because the other end is slow at sending or if the network is slowing things down via packet loss.
队头堵塞，并且App无法判断堵塞的原因，是发送方的速度慢，还是网络丢包。
本文链接：https://cs.pynote.net/net/tcp/202202061/
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