add asio-kcp

README.md

@@ -120,15 +120,43 @@ TCP是为流量设计的（每秒内可以传输多少KB的数据），讲究的
 - [KCP 最佳实践](https://github.com/skywind3000/kcp/wiki/KCP-Best-Practice)
 - [同现有TCP服务器集成](https://github.com/skywind3000/kcp/wiki/Cooperate-With-Tcp-Server)
 - [传输数据加密](https://github.com/skywind3000/kcp/wiki/Network-Encryption)
-- [应用层流量控制](https://github.com/skywind3000/kcp/wiki/Flow-Control-for-Users)
-
+- [应用层流量控制](https://github.com/skywind3000/kcp/wiki/Flow-Control-for-Users)
+- [性能评测](https://github.com/skywind3000/kcp/wiki/KCP-Benchmark)
 
 # 相关应用
 
-
 - [dog-tunnel](https://github.com/vzex/dog-tunnel): GO开发的网络隧道，使用 KCP极大的改进了传输速度，并移植了一份 GO版本 KCP
-- [lua-kcp](https://github.com/linxiaolong/lua-kcp)：KCP的 Lua扩展，用于 Lua服务器
+- [lua-kcp](https://github.com/linxiaolong/lua-kcp)：KCP的 Lua扩展，用于 Lua服务器
+- [asio-kcp](https://github.com/libinzhangyuan/asio_kcp): 使用 KCP的完整 UDP网络库，完整实现了基于 UDP的链接状态管理，会话控制，KCP协议调度等，可直接使用的用户库。
 
+# 性能比较
+
+感谢 [asio-kcp](https://github.com/libinzhangyuan/asio_kcp) 的作者 [zhangyuan](https://github.com/libinzhangyuan) 对 KCP 与 enet, udt做过的一次横向评测，结论如下：
+
+- The kcp is the first choice for realtime pvp game.
+- The lag is less than 1 second when network lag happen. 3 times better than enet when lag happen.
+- The enet is a good choice if your game allow 2 second lag.
+- UDT is a bad idea. It always sink into badly situation of more than serval seconds lag. And the recovery is not expected.
+- Has good performace in wifi and phone network(3G, 4G).
+- Extra using 20% ~ 50% network flow for speed improvement.
+- enet has the problem of lack of doc. And it has lots of functions that you may intrest.
+kcp's doc is chinese.
+Good thing is the function detail which is writen in code is english. And you can use asio_kcp which is a good wrap.
+- The kcp is a simple thing. You will write more code if you want more feature.
+- UDT has a perfect doc. UDT may has more bug than others as I feeling.
+
+具体见：[横向比较](https://github.com/libinzhangyuan/reliable_udp_bench_mark/blob/master/bench_mark.md) 和 [这里](https://github.com/skywind3000/kcp/wiki/KCP-Benchmark)。截取一段在网络糟糕时，asio-kcp/enet的延迟数据：
+
+```cpp
+worst network lag happen:
+asio: 10:51.21
+291  295   269   268   231   195   249   230   225   204
+
+enet: 10:51.21
+1563   1520    1470    1482    1438    1454    1412    1637    1588    1540
+```
+
+我当年主要测试了 KCP和 TCP/UDT的比较，扫了一眼 libenet觉得协议实现中规中矩，缺乏很多现代传输协议的技术，所以并没有详细测试。而 asio-kcp的作者同时给出了KCP/enet/udt三者的详细比较，为更多犹豫选择使用那一套的人提供了更多指引。
 
 
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