UDP offload gets you implicitly today: - 64 packets per syscall, which is enough data to amortize the syscall overhead - a single packet is not. - UDP offload

UDP offload gets you implicitly today: - 64 packets per syscall, which is enough data to amortize the syscall overhead - a single packet is not. - UDP offload optionally lets you defer checksum computation, often offloading it to hardware. - UDP offload lets you skip/reuse route lookups for subsequent packets in a bundle. What UDP offload is no good for though, is large scale servers - the current APIs only work when the incoming packet chains neatly organize into batches per peer socket. If you have many thousands of active sockets you’ll stop having full bundles and the overhead starts sneaking back in. As I said in another thread, we really need a replacement for the BSD APIs here, they just don’t scale for modern hardware constraints and software needs - much too expensive per packet.