bob wrote:
>> It exposes how slow the systems in the UK really are from most ISPs.
>> Nearly every UK ISP falls into this category. Everyone oversells
>> bandwidth at ridiculous levels (to the point that if everyone maxed
>> their connection simultaneously, you'd see sub-dialup speeds) on the
>> increasingly shaky assumption that people don't need that much bandwidth.
> Telecoms has always worked this way, and it would be absurd not to do it.
> It's actually good for heavy users, because they are subsidized by light
> users.
Sure, but it's the "increasingly shaky" part of my quote that's
important here. If the infrastructure doesn't grow to reflect increases
in both individual peak bandwidth usage and group usage, then speeds
deteriorate over time.
As it stands, many ISPs (mine included, Demon) have trouble feeding
Youtube at peak times where there were no problems a year or two ago.
And that's for a low bitrate service. BT have done their job admirably
in reducing contention at exchanges where it arises. (I can pull 2Mbit
consistently at any time of the day to peered sites, and that's capped.)
A lot of the ISPs, however, are not keeping up and I'm not sure I can
blame them. Transit is a lot more expensive than the current pricing
model of most ADSL connections could sustain. Throw in stable pricing
with an increasing interest in services like BitTorrent and you have a
bandwidth disaster on your hands.
For the most part, I use Demon to connect me from my house to LINX and
then proxy through a peered server with uncongested uplinks to attain
decent speeds. Costs a fortune but it's a better service than most
business ADSL packages could provide.
--
Jay L. T. Cornwall,
http://www.esuna.co.uk/~jay/
PhD Student
Imperial College London