Daniel Lee gave an intelligent explanation about why the amount of piece
data being transferred isn't the same as the overall network footprint,
and you dismissed this as "hand waving."

So I've spent the last 45 minutes doing snapshots of different
BitTorrent clients to demonstrate that this behavior in all BitTorrent
clients, not a simple Transmission bug.

HOW TO READ THESE SCREENSHOTS

Each screenshot shows a different BitTorrent client downloading the same
Ubuntu ISO torrent with speed capped at 15 KB/s both ways, next to a
gnome-system-monitor showing overall network use.  As a visual aid I've
added a horizontal green line showing the "ideal" of where a constant 15
KB/s would lie on each g-s-m network graph.

> How are other clients able to control this global transfer[including 
> over-head] too?
Vuze does this very well, if we set a global limit then it *is* honored.

No.  As the screenshots show, Vuze has the same behavior.  In fact, if
you look at the magnitude and frequency of its deviations from the 15
KB/s goal, you'll see that it actually does much worse than
Transmission.

-- 
Transmission bit-torrent doesn't honor speed limitation preferences
https://bugs.launchpad.net/bugs/460733
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