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Upload speed drops every 30sec., then rises again (while downloading)


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When downloading a single torrent, my upload speed keeps going up and down, and with it my download speed. To illustrate this (and my settings), I made a screenshot (1680×1050): http://img297.imageshack.us/img297/9523/utorrentweird2censoredp.png

I set all speed and connection settings up according to the settings for 20Mbit here: http://forum.utorrent.com/viewtopic.php?id=34259&p=1 (yeah I have a pretty solid connection :) )

It probably has something to do with optimistic unchoke, since that happens every 30 seconds, exactly the frequency of my speed fluctuations. Every 30 seconds, approximately 10 peers are disconnected ("disconnect: timeout due to inactivity" in the log).

I also continuously get messages "disconnect: connection closed", about 10-20 in 30 seconds.

It has nothing to do with my firewall. I couldn't check if the router was involved in this, because I have no access to it (central university router). I don't think it's network throttling (I'm on university network, they allow virtually everything), but who knows.

Does anyone have an idea how this problem is caused, and how it could be solved?

PS: I run windows 7 beta, but I don't think that has anything to do with the problem.

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