[tor-bugs] #24022 [Core Tor/Tor]: Make clients avoid retrying slow exits when they time out

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#24022: Make clients avoid retrying slow exits when they time out
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 Reporter:  teor                                 |          Owner:  (none)
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      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:  #21394                               |         Points:
 Reviewer:                                       |        Sponsor:
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Changes (by arthuredelstein):

 * cc: arthuredelstein (added)


Comment:

 Replying to [comment:2 teor]:
 > Oh, I see. Those were attempts to random exits that timed out before
 completing.
 > Maybe we could fix that at the client level by keeping an exit failure
 cache?
 > But the client would still need to experience some timeouts before it
 could skip failed exits.

 Given that there are hundreds of exits and, at least in my naive
 measurement, ~20% timeout, it sounds not super useful. So I think for
 solving #21394 I would be more inclined to rely on self-reporting by
 relays (#24014) or external testing by bandwidth authorities (#24010).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24022#comment:3>
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