[Codel] [Bloat] The challenge

[Neil Davies]

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
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