Quote:
Originally Posted by qasdfdsaq
Given each downstream channel requires a certain amount of upstream bandwidth to work, it does.
Considering one downstream channel uses up to 5-10% of the upstream channel capacity to run, fully utilizing 8 downstream channels with one upstream could result in up to 80% of the upstream capacity being utilized just to operate the downstream, while nobody is uploading anything. That leaves very little upstream capacity left over for actual uploading, especially given congestion issues can begin at above 70% upstream utilization.
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There's an interesting article on the subject
here.
The takeaway in the context of Qasi's post is that the frequency of ACKs sent back (through a busy) upstream on data received will slow the download (decrease throughput).
Whether or not that is a 5-10% overhead I'll leave to Qasi to justify, if he cares to. But it is an important point that he makes.