uTorrent 1.9 Alpha build 15380

Copied from the uTorrent forum:



New alpha!

The main change is that uTP (UDP torrenting) is added and enabled by default.

It also has real-time transfer rate control and latency minimization.

This build will probably download slower than 1.8.1, particularly if the entire swarm is 1.8.1.What is not in 1.9:

UDP tracker



What is in 1.9:

uTP, the micro transport 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. In addition we now implement NAT hole-punching for uTP connections, so connectivity should be improved for peers that do not have their ports mapped.



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 onlyChangelog:2009-05-05: Version 1.9 (build 15380)Change: rss.feed_as_default_label controls whether a torrent added from a feed is given the feed's name as a labelFix: uTP packet size fix. Sometimes it would send packets exceeding MTU.

Fixes long standing rate oscillations.



Fix: fixed crash when receiving a malformed PEX message



Fix: evades potential crash when reporting crashdumps



Fix: crash when parsing some magnet uri components without values



Fix: crash when starting a torrent in super seed mode and connecting to peers before it's completely loadedChange: Installer UI checkbox whether to install or run standalone



Change: Left align numeric fields in settingsFix: Remember category list selection after adding a torrentChange: Disabled feed icon has precedence over broken feed iconFix: DHT bootstrap failures now have an exponential back-off2009-04-1: Version 1.9 (build 14981)Fix: uTP would not ramp up its rate fast enoughChange: .torrent association not a factor in displaying the installerFix: remove file association registry keys on uninstall



Fix: invalid encoding of non-ascii urls in web seeds



Fix: uTP fix when receiving acks for old packets



Fix: uTP variable packet size bugChange: link to EULA in installer



Change: added knob to set the uTP target delay (adjusts how hard to push uTP uploads)Fix: don't wait indefinitely for trackers and UPnP when shutting down (two new advanced options)2009-03-24: Version 1.9 (build 14908)Fix: fixed bug where uTP might send packets larger than the MTU



Fix: fixed inaccuracy in net.calc_overhead



Fix: download rate limiter for uTP connections



Fix: lowered uTP overhead by increasing the max packet size to fit mtuChange: Enable DEP Compatibility and Image RandomizationFix: default download folder was not used when using the WebUI



Fix: improve TCP/uTP mixed mode



Fix: removed limit of 100 running torrentsChange: support some older skinsFix: .dat file memory leak



Fix: Torrent create bug introduced while optimizing file order



Fix: uTP selective ack was broken



Fix: uTP bug introduced while lowering overheadChange: Preserve file order textFix: Prompt for .torrent association with new installsChange: Default bt.graceful_shutdown=true and diskio.no_zero=trueFix: Integrity check .dat files after saving. Do not overwrite file.dat.old with a bad file.dat2009-02-25: Version 1.9 (build 14659)Change: uTP variable packet sizes (decreases overhead)



Change: added code for handing bundles with the bundle type encoded in the bundle



Change: modified the bundle code to unconditionally pop up dialog box



Change: modified installer to remove the extra 32 bytes for the bundle type when installing from bundle



Change: added checkbox to the build torrent dialog so the user has the option not to rearrange the file order.



Change: Modified the string for the "Start Seeding" checkbox to use 't' as the shortcut since 's' was being used by "Create and Save As..."



Change: lengthen "About" dialogFix: no longer shows "make this your default .torrent handler" when running a bundle