tldr: cloudflare like to reimplement things and claim it solves the world problems. Thats cool, thats how open source work. Fork, copy, reimplement, try new stuff.<p>that-said...slightly-longer: for what they do there are alternatives like ipset
for other things its not as clear-cut, hence things like PF_RING. its not that great thought, you&#x27;re sacrificing all features for fast sniffing.<p>technically a good zero-copy implementation of packet mmap w&#x2F; a userspace ring would achieve +- the same thing, too.