[tor-bugs] #21394 [Core Tor/Tor]: connection timeouts are affecting Tor Browser usability

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#21394: connection timeouts are affecting Tor Browser usability
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 Reporter:  arthuredelstein                      |          Owner:  (none)
     Type:  defect                               |         Status:
                                                 |  merge_ready
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.2.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-performance, tbb-usability,      |  Actual Points:
  performance, tbb-needs                         |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
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Comment (by arma):

 Replying to [comment:53 Dhalgren]:
 > that in this case nothing is sent and the client times-out at 10 seconds
 independently

 For added fun, the client starts its 10 second timer when it sends the
 begin cell, so if it takes x seconds for the begin cell to make it to the
 exit, and y seconds for a response (failure *or* success) to make it back
 to the client, then the exit needs to do its thing in 10-x-y seconds or it
 won't happen in time. Typical values of x and y are 0.5 seconds. So,
 approximating things as 10 seconds is not crazy, but don't plan to be
 doing anything new at the 8 or 9 second mark and expect it to have as much
 impact.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:54>
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