On Wed, Sep 21, 2016 at 3:25 PM, Dave Taht <dave.t...@gmail.com> wrote: > > So it seems my intuition was wrong, at least for these scenarios. It wasn't > > CUBIC that would kill BBR, it's the other way around. > > My intuition was that "delay based TCPs can't work on the internet!" - > and was wrong, also.
Keep in mind that BBR is not really "delay-based", at least in the traditional sense. BBR is not based on backing off in response to a single signal like loss or RTT increases. If BBR could be said to be "based" on any one thing, it's "model-based": it has a model of the network with two parameters: bottleneck bandwidth and round-trip propagation time. So delay increases do not always lead to a slower sending rate or lower volume of data in flight. For example, if the round-trip propagation delay increases but the bandwidth stays constant, BBR can actually increase the amount of data in flight in order to achieve its fair share of the bandwidth available in the longer pipe. Thanks for all this testing! neal _______________________________________________ Cerowrt-devel mailing list Cerowrt-devel@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/cerowrt-devel