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use μTP #1179

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opened 2010-08-15 05:03:15 +00:00 by zooko · 0 comments
zooko commented 2010-08-15 05:03:15 +00:00
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μTP is a "low extra delay transport" designed and implemented by BitTorrent, Inc.. It might have some advantages over TCP for our purposes, such as allowing more interactive network usage (web page loads, ssh sessions) to proceed unhindered while Tahoe-LAFS is uploading or downloading files "in the background", navigating past NATs more easily (see related issues #169 (tcp hole-punching!), #49 (UPnP), and #50 (STUNT/ICE)), avoiding strange limitations on TCP connections (e.g. #605), or other benefits. It might also have drawbacks.

We would probably want to support both TCP-based and μTP-based transport for the forseeable future, choosing between them based on whether the peer supports μTP and whether the user wants this operation to be "foreground" (they are watching the movie as it downloads) or "background" (they are browsing the web while the movie downloads in the background).

See Brian Warner's and Greg Hazel's detailed discussion about what it would take to use μTP in Tahoe-LAFS in the mailing list messages below.

Here are some tahoe-dev messages about it:

  • [//pipermail/tahoe-dev/2010-May/004381.html]
  • [//pipermail/tahoe-dev/2010-May/004396.html]
  • [//pipermail/tahoe-dev/2010-May/004397.html]
  • [//pipermail/tahoe-dev/2010-May/004398.html]
  • [//pipermail/tahoe-dev/2010-May/004400.html]
  • [//pipermail/tahoe-dev/2010-June/004405.html]
  • [//pipermail/tahoe-dev/2010-June/004407.html]
  • [//pipermail/tahoe-dev/2010-July/004669.html]
  • [//pipermail/tahoe-dev/2010-August/004861.html]

Here are some arguments about various aspects of μTP's design and implementation:

μTP is a "low extra delay transport" designed and implemented by BitTorrent, Inc.. It might have some advantages over TCP for our purposes, such as allowing more interactive network usage (web page loads, ssh sessions) to proceed unhindered while Tahoe-LAFS is uploading or downloading files "in the background", navigating past NATs more easily (see related issues #169 (tcp hole-punching!), #49 (UPnP), and #50 (STUNT/ICE)), avoiding strange limitations on TCP connections (e.g. #605), or other benefits. It might also have drawbacks. We would probably want to support both TCP-based and μTP-based transport for the forseeable future, choosing between them based on whether the peer supports μTP and whether the user wants this operation to be "foreground" (they are watching the movie as it downloads) or "background" (they are browsing the web while the movie downloads in the background). See Brian Warner's and Greg Hazel's detailed discussion about what it would take to use μTP in Tahoe-LAFS in the mailing list messages below. Here are some tahoe-dev messages about it: * [//pipermail/tahoe-dev/2010-May/004381.html] * [//pipermail/tahoe-dev/2010-May/004396.html] * [//pipermail/tahoe-dev/2010-May/004397.html] * [//pipermail/tahoe-dev/2010-May/004398.html] * [//pipermail/tahoe-dev/2010-May/004400.html] * [//pipermail/tahoe-dev/2010-June/004405.html] * [//pipermail/tahoe-dev/2010-June/004407.html] * [//pipermail/tahoe-dev/2010-July/004669.html] * [//pipermail/tahoe-dev/2010-August/004861.html] Here are some arguments about various aspects of μTP's design and implementation: * <http://forum.bittorrent.org/viewtopic.php?id=119> * <http://forum.utorrent.com/viewtopic.php?id=69592> * <http://forum.utorrent.com/viewtopic.php?id=69416>
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Reference: tahoe-lafs/trac-2024-07-25#1179
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