Sequencing is important. IP doesn't guarantee order; the kernel takes the segments of a TCP connection and then delivers them in order to the application as it

Sequencing is important. IP doesn't guarantee order; the kernel takes the segments of a TCP connection and then delivers them in order to the application as it reads from the socket. It will hold segments that arrive early and block if a segment is missing. If you don't care about the order you are receiving things then you want UDP. Is it better for userspace to do the sequencing? Maybe given NUMA - a process might be "closer" to its memory than the kernel and therefore could eat its traffic in the correct order locally faster than being fed by the kernel.