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By: a guest on Feb 9th, 2010  |  syntax: None  |  size: 5.23 KB  |  views: 70  |  expires: Never
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  1. [17:45] <Y>     There's bugs in uTorrent recently that cause that I believe
  2. [17:45] <Y>     I can't my finger on WHAT exactly triggers bad results, I just have lots of (indirect) evidence that there is.
  3. [17:46] <Z>     yeah, ever since 1.8.2+
  4. [17:46] <Z>     1.8.2 worked great
  5. [17:46] <Y>     mention that in open chat :)
  6. [17:46] <Y>     I've heard a few offhanded remarks from alus and other devs that various changes were made post v1.8.2
  7. [17:46] <Y>     for instance, how uTP was handled.
  8. [17:47] <Z>     yeah
  9. [17:47] <Y>     bt.trans_disposition before that was only 0 or 255 typically
  10. [17:47] <Z>     yeah i remember that
  11. [17:47] <Y>     I'm hunting a very strange bug...one where torrents aren't starting/downloading when they should.
  12. [17:48] <Y>     Xapti in fact seems to exhibit some/most of that bug.
  13. [17:48] <Z>     what were the major changes from 1.8.2+
  14. [17:48] <Y>     I haven't seen it on torrents I've done, but I generally only seed.
  15. [17:48] <Z>     cant they go back?
  16. [17:48] <Y>     uTP changes galore, total rewrite of the networking engine starting in v1.8.5 (actually v1.9 came first)
  17. [17:49] <Y>     udp trackers in v2.0
  18. [17:49] <Y>     uTP NAT hole-punching in v2.0
  19. [17:49] <Y>     Webui changes
  20. [17:49] <Y>     BT DNA was added as well, but not enabled in any fashion supposedly...in v1.8.5 or v2.0
  21. [17:50] <Y>     There's been some really horrid half open handling issues by uTorrent between v1.8 and 2.0
  22. [17:50] <Y>     one of the most recent that was decently documented was the HTTPS trackers that timeout were being counted as half open connections even hours later.
  23. [17:51] <Y>     So 1 failed HTTPS tracker could soon mean uTorrent quits making outgoing connections. People's insane workaround was to keep increasing how many half open connections uTorrent tries to make at once.
  24. [17:51] <Z>     yeah, I had to set mine to like 1000
  25. [17:51] <Z>     :(
  26. [17:52] <Z>     looks like im gonna go back to 1.8.5
  27. [17:52] <Y>     I lower mine typically to 4.
  28. [17:52] <Z>     for the time being
  29. [17:52] <Z>     boo
  30. [17:52] <Y>     why?
  31. [17:52] <Y>     I only run 10-30 torrents at a time
  32. [17:52] <Z>     because of my upload speed
  33. [17:52] <Z>     i was running 2 torrents
  34. [17:52] <Y>     upload speed cares not
  35. [17:52] <Z>     and not getting no where near the same speeds i was getting when i was using 1.8.5
  36. [17:52] <Y>     half open connections do *NOT* count uTP, Teredo, incoming connections
  37. [17:53] <Y>     half open only applies to outgoing TCP peers/seeds and HTTP/HTTPS tracker updates
  38. [17:53] <Y>     if you're unfirewalled, your incoming connections should be far more common.
  39. [17:53] <Z>     no, not firewall
  40. [17:54] <Y>     The big problem is uTorrent will continually retry dead and busy ips with a high half open, helping nobody really. It only very slowly backs off if the line is dead.
  41. [17:55] <Z>     has this always been the case?
  42. [17:55] <Z>     even with previous versions?
  43. [17:55] <Y>     Routers can "stuff up" their iptables due to these failed connection attempts, and then bomb softly or craptacularly.
  44. [17:55] <Y>     some ways yes, some ways no.
  45. [17:55] <Y>     The big problem NOW is bt.connect_speed
  46. [17:55] <Y>     that's how FAST to make outgoing connections in connections per second.
  47. [17:56] <Z>     should i make some changes to mine?
  48. [17:56] <Y>     Thanks to Teredo and uTP not being limited by net.max_halfopen...the number of in-progress outgoing connection attempts at once could soar from the previous default limit of 8 to 300!
  49. [17:57] <Y>     That's because bt.connect_speed was 20 new connections per second
  50. [17:57] <Y>     but the failed ones won't "give up" and time out typically for ~15 seconds.
  51. [17:57] <Y>     20 x 15 = 300
  52. [17:58] <Y>     In practice I was seeing >200 in progress at once often when running "busy" torrents with lots of seeds/peers.
  53. [17:58] <Y>     uTorrent now has stricter (TOO STRICT) handling of upload slots, especially for a line such as yours.
  54. [17:59] <Y>     Each active torrent that has even 1 peer is treated as though it has max upload slots for limiting purposes.
  55. [17:59] <Z>     yeah :( i set my slots to 40
  56. [17:59] <Z>     should i increase my slots?
  57. [17:59] <Y>     no, try decreasing default upload slots to 20 but raise upload slots on an extremely busy torrent as needed.
  58. [18:00] <Y>     Otherwise the torrents with just 1 peer counts as having 40 upload slots...then current total upload speed is used to determine max allowed upload slots per torrent.
  59. [18:00] <Z>     ahhhh
  60. [18:00] <Z>     ok
  61. [18:01] <Y>     Even at 5000 KB/sec, uTorrent probably is kicking max upload slots down to <20 :(
  62. [18:01] <Y>     except it's a vicious cycle...speed briefly drops lower = fewer upload slots per torrent allowed!
  63. [18:04] <Y>     this dovetails into another flaw/bug, when upload slots = 1 per torrent
  64. [18:05] <Y>     The optimistic unchoke "roaming" upload slot is always used first, which jumps between peers and doesn't upload as long to one as 'regular' upload slots.
  65. [18:05] <Y>     uTorrent was programmed to change which peer that uploads to at 1 or 2 minute intervals, so EVERY torrent changes all that the same time.
  66. [18:06] <Y>     ...which triggers another upload speed drop-off even if upload slots are still above 1 per torrent.
  67. [18:06] <Y>     And I've even seen torrents with just 1 peer not being uploaded to at all because uTorrent tried to switch to upload to a different peer. :P
  68. [18:11] <Y>     read this to find out more about half open and upload slots: http://forum.utorrent.com/viewtopic.php?pid=417225#p417225
  69. [18:11] <Z>     thanks
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