[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:  new
 Priority:  Very High                            |      Milestone:  Tor:
                                                 |  0.3.3.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 arthuredelstein):

 Here's a table of the same data as comment:27. The second column,
 timeout_rate_21394, shows the fraction of connections for each exit that
 timed out (after 10 seconds). I also included onionoo relay metadata so we
 can look for any patterns:

 https://docs.google.com/spreadsheets/d/16-SCjR7dTjEN_O3MOX4ZhlR47tvJYONmXICNJkGYnvw/edit?usp=sharing

 One thing I noticed is that bad relays have higher than average consensus
 weights. Here are the average consensus weights for relays with different
 DNS behaviors:
 * Bad (always timed out): 38612
 * Flaky (sometimes timed out): 10440
 * Good (never timed out): 7042

 That trend explains why I see higher timeout frequency with Tor Browser
 than with my DNS timeout survey script.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:28>
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