[Bloat] Bufferbloat Paper

[David Lang]

On Tue, 8 Jan 2013, Mark Watson wrote:

> On Jan 7, 2013, at 4:33 PM, Dave Taht wrote:
>
>> "We use a packet trace collection taken from the Case Con-
>> nection Zone (CCZ) [1] experimental fiber-to-the-home net-
>> work which connects roughly 90 homes adjacent to Case
>> Western Reserve University’s campus with **bi-directional 1 Gbps
>> links**. "
>>
>> Aside from their dataset having absolutely no reflection on the
>> reality of the 99.999% of home users running at speeds two or three or
>> *more* orders of magnitude below that speed, it seems like a nice
>> paper.
>
> Actually they analyze the delay between the measurement point in CCZ and the 
> *remote* peer, splitting out residential and non-residential peers. 57% of the 
> peers are residential. Sounds like a lot of the traffic is p2p. You could 
> argue that the remote, residential p2p peers are not on "typical" connections 
> and that this traffic doesn't follow the time-of-day usage patterns expected 
> for applications with a live human in front of them.

But if the "remote peer" is on a 1Gbps link, that hardly reflects normal 
conditions.

typical conditions are

          1G            1M
desktop -----firewall ---- Internet

it's this transition from 1G to 1M that causes data to be buffered. If you have 
1G on both sides of the home firewall, then it's unlikely that very much data is 
going to be buffered there.

David Lang