[klabb3]

Isn’t it also a UDP issue in general or at least the way packet switching works in Golang on major OSs? I did a bandwidth benchmark over local network over tailscale vs vanilla (in the 100MB/s ballpark) and tailscale was 10-20% slower and used tons of CPU.

As a baseline I tried pushing blank UDP packets with Golang (on Darwin and Linux) at saturated capacity and it ALSO used similar excess CPU, causing dropped packets. My take at the time was that it was primarily the syscall overhead per packet (vs per arbitrarily sized buffer in TCP), and a lack of efficient OS APIs in Golang. Is there truth to this analysis?