On Sat, Oct 22, 2022 at 12:14:25PM +0200, Hans Petter Selasky wrote: > Hi, > > Some thoughts about this topic. > > Delaying ACKs means loss of performance when using Gigabit TCP > connections in data centers. There it is important to ACK the data as > quick as possible, to avoid running out of TCP window space. Thinking > about TCP connections at 30 GBit/s and above! > > I think the implementation should be exactly like it is. > > There is a software LRO in FreeBSD to coalesce the ACKs before they hit > the network stack, so there are no real problems there. >
Changing the ACK ratio seems to be okay in most cases, a paper I wrote about this was published this week: https://onlinelibrary.wiley.com/doi/10.1002/sat.1466 It focuses on QUIC, but congestion control dynamics don't change with the protocol. You should be able to read there, but if not I'm happy to send anyone a pdf. - Tom
