[tor-bugs] #15482 [Tor]: Don't surprise users with new circuits in the middle of browsing

Tor Bug Tracker & Wiki blackhole at torproject.org
Sat Jul 25 01:06:48 UTC 2015


#15482: Don't surprise users with new circuits in the middle of browsing
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     Reporter:           |      Owner:  mikeperry
  mikeperry              |     Status:  needs_information
         Type:           |  Milestone:  Tor: 0.2.7.x-final
  enhancement            |    Version:
     Priority:  normal   |   Keywords:  tbb-usability, MikePerry201503,
    Component:  Tor      |  tbb-wants, TorBrowserTeam201507R
   Resolution:           |  Parent ID:
Actual Points:           |
       Points:           |
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Comment (by mikeperry):

 As it is deployed today, I don't think that this patch should be changing
 the total number of circuits significantly. If you are continuously using
 a website, you will have *some* circuit open for it. Really the only thing
 this patch does is make you tend to use the same circuit for that activity
 rather than using a new one.

 In aggregate, I guess this *might* cause connections to live longer
 between relays, but I doubt it.

 What is more likely the culprit is that in Tor Browser 4.5, we also reset
 our connection keepalive to match to Firefox default of 2 minutes (up from
 20 seconds), since we solved #4100. That would cause more connections to
 stay open, since the HTTP connections are now being kept open for longer.
 I think this in combination with more users is the real problem.

 SPDY and HTTP/2 will make this even worse, since its keep-alive duration
 is potentially infinite.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15482#comment:27>
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