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Updated EN_Home (markdown)

winlin 2017-02-15 19:45:22 +08:00
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# Introduction
KCP is a fast reliable transport protocol, which use FEC(about 10%-20% bandwidth cost) to decrease the latency(about 30%-40% off), and in the best situation the latency is 1/3 of TCP. As KCP only defined the application-level APIs, the under-layer transport of KCP is not limited, user can choose any protocol preferred; that is, user must integrate KCP to the specific system, to define or choose the under-layer protocol, for instance, UDP or private protocol over UDP, feed data to KCP by callback, and setup the time-clock of KCP. There is no syscalls in KCP, it's well defined library for almost all popular transport server or applications.
KCP is a fast reliable transport protocol, which use FEC/ARQ(about 10%-20% bandwidth cost) to decrease the latency(about 30%-40% off), and in the best situation the latency is 1/3 of TCP. As KCP only defined the application-level APIs, the under-layer transport of KCP is not limited, user can choose any protocol preferred; that is, user must integrate KCP to the specific system, to define or choose the under-layer protocol, for instance, UDP or private protocol over UDP, feed data to KCP by callback, and setup the time-clock of KCP. There is no syscalls in KCP, it's well defined library for almost all popular transport server or applications.
There are only two source files, the `ikcp.h` and `ikcp.c`, so it's very easy to use KCP by copying it to your project and adapter to your protocol stack. For example, whatever your application is a P2P system, or protocol over UDP(such as RTP, RTMFP, Webrtc, RTMP or HTTP-FLV, haha), a few lines(maybe < 10) of codes can integrate KCP to your system, to use the ARQ or FEC advantage.