On 8 Dec, 2013, at 7:56 pm, Juliusz Chroboczek wrote: >> Notably it seems few have internalized what the "sparse stream" >> optimization does for things like voip. > > We're waiting with held breath until you care to enlighten us ;-)
I think I know what he's talking about. This is where a packet arriving for an empty queue will be prioritised over packets waiting at the head of queues - but a flag will be set on that empty queue to ensure that it only happens once per cycle. That reduces latency for stuff that isn't a bulk data flow. The trouble is that if there's a sufficiently large number of congested flows (eg. BitTorrent) that VoIP's "fair share" is less than what it needs, that optimisation is disabled and VoIP stops working - unless it can detect and adapt to a lower bandwidth, or unless it is classified and managed as distinct from bulk data. - Jonathan Morton _______________________________________________ Bloat mailing list Bloat@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/bloat
