> On 10 Aug, 2021, at 7:51 am, Matt Mathis via Bloat > <[email protected]> wrote: > > For years we published a "jitter" metric that I considered to be bogus, > basically max_rtt - min_rtt, (which were builtin Web100 instruments). > > In 2019, we transitioned from web100 to "standard" linux tcp_info, which does > not capture max_rtt. Since the web100 jitter was viewed as bogus, we did > not attempt to reconstruct it, although we could have. Designing and > implementing a new latency metric was on my todo list from the beginning of > that transition, but chronically preempted by more pressing problems. > > It finally made it to the top of my queue which is why I am suddenly not > lurking here and the new rpm list. I was very happy to see the Apple > responsiveness metric, and realized that M-Lab can implement a TCP version of > it, that can be computed both in real time on future tests and retroactively > over archived tests collected over the last 12 years. > > This quick paper might be of interest: Preliminary Longitudinal Study of > Internet Responsiveness
Intriguing. The properly processed version of the data will probably show the trends more clearly, too. I think there is merit in presenting the European data as well, so long as the discontinuities caused by topological/geographical alterations can be identified and indicated. There are some particular local phenomena that I think would be reflected in that, such as the early rollout of fq_codel by free.fr. - Jonathan Morton _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
