From: Christoph Paasch <cpaa...@apple.com> Date: Thu, 14 May 2020 08:53:03 -0700
> RFC8684 allows to send 32-bit DATA_ACKs as long as the peer is not > sending 64-bit data-sequence numbers. The 64-bit DSN is only there for > extreme scenarios when a very high throughput subflow is combined with a > long-RTT subflow such that the high-throughput subflow wraps around the > 32-bit sequence number space within an RTT of the high-RTT subflow. > > It is thus a rare scenario and we should try to use the 32-bit DATA_ACK > instead as long as possible. It allows to reduce the TCP-option overhead > by 4 bytes, thus makes space for an additional SACK-block. It also makes > tcpdumps much easier to read when the DSN and DATA_ACK are both either > 32 or 64-bit. > > Signed-off-by: Christoph Paasch <cpaa...@apple.com> Applied, thanks.
