Dear Dave,
Thank you for your interest in my work.
I have read another paper authored by D. Rossi at el. presenting the priority inversion problem of LEDBAT when it is used together with AQM. And it has become one of the factors that motivated me to devise a new LBE CC that can preserve low priority even when AQM is used. However, I could not test FlexiS with CoDel on the CORE emulator probably because CoDel drops packets at the dequeue time. More tests should be done to verify that FlexiS does preserve low priority in the presence of various AQM algorithms.
I am now adapting FlexiS to the receiver side. The main motivation to do so is that there might be HTTP/TCP proxies between the sender and the receiver. A receiver side LBE CC and make the connection between the proxy and the receiver LBE. In this work, I am going to tackle some open issues with FlexiS. For example, I am going to test if trend analysis can be done based on one way delay so that the throughput is less affected by ack path congestion. And I am going to evaluate various techniques to reduce rate below 2 mss per RTT. This may include what you have suggested -- use small packets and sub-packet window. I am also interested in using pacing to slow down sending rate and maybe more alternative solutions.
I don't have a git tree for the source code mainly because I don't know if I am allowed to publish the code as open source. If you are interested in the source code, I can ask the University of Oslo if I am allowed to distribute it freely?
Best regards,
Qian