On Sun, Jun 14, 2015 at 12:35 PM, Jonathan Morton <[email protected]> wrote: > >> On 14 Jun, 2015, at 21:24, Dave Taht <[email protected]> wrote: >> >> Flows, btw, do end quite rapidly in the real world. What was it, 95% >> of all web flows ended inside of IW10? > > It might be worth thinking about how heavily loaded a network needs to be for > Codel to trigger on such a flow. However, with perfect flow isolation, count > will start at 1, making it less relevant to the present thread. > > Cake will start triggering on a instantly-arrived burst (call it a packet > salvo) after 35ms. Thus, a ten-packet burst will not trigger provided at > least 4.5 Mbps is available to that flow. However, on many links that is > still a tall order, since if the flows really are that short, there are > probably lots of them in parallel. > > A paced burst is much more friendly. At a 100ms RTT, IW10 could be delivered > at 100pps (1.5 Mbps), extending the range of link speeds on which congestion > signalling will not occur by at least 3x (and generally more). Since this > greatly reduces the risk of packet loss, it might actually reduce the average > time that the sender needs to maintain the connection’s buffers, despite the > deliberate 1-RTT delay introduced.
Data point: Quic is presently 10 packet burst, 22 packets paced. Not that I like it. > - Jonathan Morton > -- Dave Täht What will it take to vastly improve wifi for everyone? https://plus.google.com/u/0/explore/makewififast _______________________________________________ Codel mailing list [email protected] https://lists.bufferbloat.net/listinfo/codel
