Um... most connections aren't saturated 24x7. Like, I have a 6Mbpsconnection and sometimes I'm just using AIM. In this situation, I'd like to measure that 5.9Mbps is free. Any clever ideas on how to accomplish this?
Well, if you are absolutely sure that your own connection always is the path bottleneck, you could simply keep track of your observed peak capacities, calculate an estimated capacity X and assume that X- your current load should be available. Keeping that estimate X on the lower end would give you a good enough approximation. This can be a good strategy for low-bandwidth access networks that then won't have to ramp up as slowly as TCP slowstart dictates.
But then, if you have a 6Mbps connection to the Internet, how often is that the actual bottleneck?
/Lars-Åke
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