Re:QUIC Is Not Quick Enough over Fast Internet
by anarazel on Monday September 09, 2024 @10:09AM
(#41488741)
FWIW, the biggest problem I've seen with efficiently using io_uring for networking is that none of the popular TLS libraries have a buffer ownership model that really is suitable for asynchronous network IO.
What you'd want is the ability to control the buffer for the "raw network side", so that asynchronous network IO can be performed without having to copy between a raw network buffer and buffers owned by the TLS library.
It also would really help if TLS libraries supported processing multiple TLS records in a batched fashion. Doing roundtrips between app <-> tls library <-> userspace network buffer <-> kernel <-> HW for every 16kB isn't exactly efficient.
What you'd want is the ability to control the buffer for the "raw network side", so that asynchronous network IO can be performed without having to copy between a raw network buffer and buffers owned by the TLS library.
It also would really help if TLS libraries supported processing multiple TLS records in a batched fashion. Doing roundtrips between app <-> tls library <-> userspace network buffer <-> kernel <-> HW for every 16kB isn't exactly efficient.