问题
If I understand, QUIC exists to multiplex multiple streams over the same UDP channel, including same key exchange.
QUIC also has an unreliable transport mode for VoIP, etc. https://datatracker.ietf.org/doc/draft-pauly-quic-datagram/
Has anyone considered a “file" transfer mode for QUIC that uses either this unreliable mode or another "less" reliable mode? Would file transfer benefit much from even less ordered delivery than a QUIC stream supports?
There is a bittorrent variant µTP (BEP-29) which exists partially to interfere less with residential internet, but supports bittorrent's usual highly unordered delivery.
I suppose a file transfer protocol for QUIC could also be bittorren-like by accepting packet sized chunks from multiple senders, but that's another topic.
回答1:
One advantage of unordered, unreliable file transfer protocols is that they do not need to pay the memory cost of keeping a retransmit buffer that grows with the BDP of the connection. Incorrect sizing of those buffers can lead to significant performance losses on high-BDP links.
The random-access persistent storage used for the files at each end allows the reordering and retransmission to be handled on the application level.
The absence of head-of-line blocking may also lead to marginally better IO utilization.
But those issues are edge-cases. For bulk-transferring a single large file within one continent the reliable stream mode of QUIC will probably perform near the throughput optimum.
来源：https://stackoverflow.com/questions/56714862/can-quic-streams-be-improved-upon-for-file-transfer