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

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue Oct 31 16:52:50 UTC 2017


#21394: connection timeouts are affecting Tor Browser usability
-------------------------------------------------+-------------------------
 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:
-------------------------------------------------+-------------------------

Comment (by arthuredelstein):

 I ran another test, this time with a CircuitStreamTimeout of 100
 (seconds):
 * Raw results:
 https://arthuredelstein.net/tor/21394/exit_results_20171031.json
 * Table for comparison with comment:28:
 https://docs.google.com/spreadsheets/d/1c3YtAtIVbQXCw6HthQgn5ZYEGuovbfc855IYielIVR4/edit?usp=sharing

 Overall timeout counts:
 Always timed out: 15
 Sometimes timed out: 61
 Never timed out: 706

 The number of stream timeout events were substantially reduced relative to
 comment:27. It's not a perfect comparison because this was done on a
 different day, and the total test time took substantially longer. But it
 does seem to suggest that DNS services for some of the exits are backed
 up, not disabled. Next I can look at the distribution of DNS response
 times. Then I plan to contact some exit relay operators with poor DNS
 response and see if they can investigate why their DNS is very slow or not
 working.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21394#comment:31>
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