Low performance at high latency between server and client

[freakinyy]

I set shadowsocks-rust with yamux-plugin between my local pc and remote server, but the bandwidth (600-700KB/s) is much lower than without yamux-plugin. Follow is my plugin options and mode:

...
"plugin_opts":"udp_timeout=30&tcp_fast_open=true",  
"plugin_mode":"tcp_and_udp",
...

But if I set shadowsocks-rust with yamux-plugin between local PC and local router (low latency), it seems that the bandwidth is much higher. I searched and found this: https://github.com/fatedier/frp/issues/2987

“通过调大yamux.Config.MaxStreamWindowSize（默认大小为256*1024，不能低于此值）可以缓解限速问题。如果带宽比较大的情况下，使用yamux做多路复用，假设多路复用客户端和服务端的RTT t ms，则单个stream的带宽约为：
((1000/t) * (MaxStreamWindowSize/2) * 8)/(1024*1024) Mbps”

So I tied to change the Config::default() when calling Session::new_client and Session::new_server in yumux-plugin-local.rs and yumux-plugin-server.rsto

let custom_config : Config = Config { 
            max_stream_window_size: (4*1024*1024),
             ..Config::default() };

The bandwidth between my local PC and remote server is much higher now (2MB/s). I am new to Rust and not good at networking, so I'm not sure if my trying is correct. So could you please test this?

[zonyitoo]

@driftluo Did you encounter the same issue?

[zonyitoo]

Just read the comments in the https://github.com/fatedier/frp/issues/2987 , your solution should be correct.

Maybe you could try to make the stream window size much higher (to get 1000Mbps brandwidth) and make a PR.

[freakinyy]

OK, I'll have a try.

[driftluo]

@driftluo Did you encounter the same issue?

yes, the default configuration bandwidth of yamux is very low, it is recommended that users adjust it according to their own situation

[raintean]

According to past practice, yamux protocol has 70~80% performance loss than raw tcp when use default config(rtt 150ms). loss of GRPC(h2 mux) is 50% +-. I do lot of work on this, but it dosen't work very well. 😢

QUIC is the silver bullet

[zonyitoo]

https://github.com/shadowsocks/qtun

You may want this plugin.