[Question] Performance issue in multi-thread runtime

[zonyitoo]

I couldn't find another use cases in Github with tokio except yours.

I am working on a Project with also using smoltcp as an user space network stack and provide wrappers for interpolate with existed Tokio IO structs (TcpStream, ...), but I found some problems:

1. Since Interface::poll requires to call frequently in a very short interval, it have to be put in a separated task (the Reactor in this Project).
2. In the latest version of smoltcp, SocketSet is now managed by Interface, so if you want to call Interface::poll, and also AsyncRead::poll_read and AsyncRead::poll_write on TcpStream (wrapper of TcpSocket), you will have to take a lock on the Interface. (which is the same in this Project, the SocketAllocator).

I don't know if you have any benchmark data about the current design of tokio-smoltcp. I made a simple test with iperf3, which showed that the interface is relatively slower than system's network stack.

Here I open an issue and hoping you can share any informations about this with me.