Re: [p2pi] Information in an ALTO protocol

On Sep 15, 2008, at 7:22 AM, Laird Popkin wrote:

> If a p2p application knows roughly what bandwidth the user is  
> provisioned with, it can set reasonable defaults.
>
> For example, Azureus' configuration wizard asks users what kind of  
> uplink speed they have (e.g. dial, 128K, 256K, ..., 1M) and uses  
> different application level values (e.g. max upload speed, number of  
> active transfers, number of active peer connections) appropriate for  
> that kind of network connection. If they could automatically  
> configure themselves rather than asking the user a rather  
> intimidating (to a non-technical consumer) question, that would be  
> better for the users and the network.

If you control a well-connected server, you can probably do this  
pretty easily (at least into the right ballpark) with just a few sets  
of back-to-back UDP packets to estimate uncongested-link bandwidth: at  
least to get

If you do this on startup and IP address change, use 8, 1000B packets  
(4 pairs), and have 10M clients a day doing a test, this would  
require, roughly, 80 GB of upload bandwidth a day.

Given the cost of EC2 as a host for such a test server, this would  
cost a company <$20/day in bandwidth to support 10M clients a day.

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