On Sat, Sep 10, 2016 at 11:54 PM, Jim Gettys <jg@xxxxxxxxxxxxxxx> wrote: > > > On Sat, Sep 10, 2016 at 3:33 PM, Toke Høiland-Jørgensen <toke@xxxxxxx> > wrote: >> >> CoDel can be too aggressive if a station sends at a very low rate, >> leading to starvation. This gets worse the more stations are present, as >> each station gets more bursty the longer the round-robin scheduling >> between stations takes. >> >> This adds dynamic adjustment of CoDel parameters per station. It uses >> the rate selection information to estimate throughput and sets more >> lenient CoDel parameters if the estimated throughput is below a >> threshold. To not change parameters too often, a hysteresis of two >> seconds is added. > > > Where is this 2 second constant coming from? I'd expect it should be of > order the maximum RTT (or a small constant factor of that, which for > intercontinental connections should be 200-300ms. > Indeed, from Mauritius (Africa) to remote countries like Australia, or parts of the US, we see latencies of up to 500-600ms.
