Download µTorrent 1.9 build 13485 alpha

Yesterday a new development process started for µTorrent for Windows, which will eventually lead to version 1.9. µTorrent is a popular and very complete Bittorrent client that uses little or no memory and processor. In addition, the size of the program is also minimal and you can play a nice game while waiting for the download to arrive Tetris to play. New in version 1.9 is uTP, a way of data transport, where reliability and minimal latency are the spearheads:

What’s not in 1.9:
UDP hole punching (yet?)
UDP tracker

What’s in 1.9:
uTP, the microtransport protocol. This UDP-based reliable transport is designed to minimize latency, but still maximize bandwidth when the latency is not excessive. We use this for communication between peers instead of TCP, if both sides support it. In addition, we use information from this transport, if active, to control the transfer rate of TCP connections. This means uTorrent, when using uTP, should not kill your net connection – even if you do not set any rate limits.

What was in 1.8.1:
uTP, but connection attempts were not initiated by default, and there was no control over TCP as described above. You can enable it, but likely you will see the uTP connections not transfering much data, because they are pushed out of the way by TCP.

What this means for rate control:
You are still free to set rate limits and use external limiters. The “Automatic upload rate” control is flawed enough for most people that it will likely be removed once uTP is well tested and deployed, since it entirely supercedes that feature.

How to enable and disable it:
Preferences > Advanced, set bt.transp_disposition to:
255 – both TCP and uTP (default)
10 – uTP only
5 – TCP only[break]