Bit unfair to BT... BT have architected their network so that cells loss doesn't happen.
They pace the cell rate, on a per line basis, in their BRASs so that individual DSLAM buffers are not overrun. The PPP sessions are terminated in BT's BRAS - the ISPs LNS establishes an L2TP tunnel to the BRAS. As for the sanity, we've measured other ISPs in the UK. They deliver consistently more jitter and loss than BT's *wholesale* network. Neil On 10 May 2012, at 15:42, David Woodhouse wrote: > On Thu, 2012-05-10 at 10:25 -0400, Justin McCann wrote: >> Can't they turn on Early Packet Discard or something similar? This >> seems like a no-brainer. > > This is British Telecom we're talking about. > > No, we cannot expect them to do *anything* even half sane. > > The ISP has clue, and the PPP session handled by BT's DSLAM is > terminated in an L2TP session on their LNS. For the foreseeable future, > that is where any queue management has to happen. > > -- > dwmw2 > _______________________________________________ > Bloat mailing list > [email protected] > https://lists.bufferbloat.net/listinfo/bloat _______________________________________________ Bloat mailing list [email protected] https://lists.bufferbloat.net/listinfo/bloat
