You'll hit game engine CPU usage limits way before getting anywhere near Gbit/s in outbound game traffic on a game server, and the cost of network I/O is going

You'll hit game engine CPU usage limits way before getting anywhere near Gbit/s in outbound game traffic on a game server, and the cost of network I/O is going to be negligible. XDP is useful for applications that are network I/O bound. Gaming is not one of those.