[tor-bugs] #20922 [Core Tor/Tor]: Consider faster retry schedule for primary guards

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#20922: Consider faster retry schedule for primary guards
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 Reporter:  nickm         |          Owner:
     Type:  defect        |         Status:  needs_review
 Priority:  Medium        |      Milestone:  Tor: 0.3.0.x-final
Component:  Core Tor/Tor  |        Version:
 Severity:  Normal        |     Resolution:
 Keywords:                |  Actual Points:
Parent ID:  #19877        |         Points:
 Reviewer:                |        Sponsor:
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Comment (by asn):

 I think this is a good change for the cases where we marked our primaries
 as down while we were offline, and now we are only dealing with confirmed
 guards. This change will make us go back to our primaries much faster.

 That said, this change has performance implications when the top primary
 guards are legitimately down, since we will have to wait about 2 minutes
 for each primary guard connection to timeout every 10 minutes.

 I currently think that this change is worth doing, but I would need to
 test this branch more in real life situations to see if the performance
 penalty is too annoying.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/20922#comment:4>
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