On Wed, Oct 26, 2022 at 02:55:21PM +0200, tue...@freebsd.org wrote: > > On 26. Oct 2022, at 10:57, Tom Jones <t...@freebsd.org> wrote: > > > > 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. > Is QUIC using an L=2 for ABC?
I think that is the rfc recommendation, actual deployed reality is more scattershot. - Tom
