Hi Jason let me apologise for the harsh tone. I should have been able to phrase my point way politer, but clearly failed. I am sure your testing matrix was large enough already and tested those conditions you considered most urgent for your use-cases. I understand that I am free to test what ever I am interested in L4S myself.
Regards Sebastian > On 22. May 2024, at 14:54, Sebastian Moeller <moell...@gmx.de> wrote: > > Hi Jason > >> On 22. May 2024, at 14:27, Livingood, Jason <jason_living...@comcast.com> >> wrote: >> >> [SM] Here is Pete's data showing that, the middle two bars show what happens >> when the bottleneck is not treating TCP Prague to the expected signalling... >> That is not really fit for use over the open internet... >> >> [JL] That graph is not anything like what we’ve seen in lab or field >> testing. I suspect you may have made some bad assumptions in the simulation. > > > So have you actually tested 1 TCP CUBIC versus 1 TCP Prague flow over a FIFO > bottleneck with 80ms minRTT? > Then, I would appreciate if you could share that data. > > My best guess is, that you did not explicitly test that (*). I expect almost > all testing used short RTTs and likely the low latency docsis scheduler/AQM > combination (essentially an implementation close to DualQ). But I am happy to > be wrong. > > One of my complaints of the data presented in favor of L4S during the > ratification process was (and still is) that we got a multitude of very > similar tests all around locations n parameter space that were known to work, > while the amount od even mildly adversarial testing was miniscule. > > *) As Jonathan implied the issue might be TCP Prague"s pedigree from TCP Reno > mostly, as Reno and Cubic compete similarly unequal at 80ms RTT. To which I > asked, who came up with the idea of basing TCP Prague on Reno in the first > place? Changing that now, essentially will invalidate most previous L4S > testing. See above why I do not believe this to be a terrible loss, but just > procedurally I consider than not very impressive engineering. That aside. if > this explanation is correct, the only way for you not having encountered that > dutring your tests is by not actually testing that condition. But that in > turn makes waters down the weight of the claim "not anything like what we’ve > seen in lab or field testing" considerably, no? > > > _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat