[tor-bugs] #22453 [Core Tor/Tor]: Relays should regularly do a larger bandwidth self-test

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#22453: Relays should regularly do a larger bandwidth self-test
-------------------------------------------------+-------------------------
 Reporter:  arma                                 |          Owner:  juga
     Type:  defect                               |         Status:
                                                 |  needs_information
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.4.0.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  034-triage-20180328,                 |  Actual Points:
  034-removed-20180328, tor-bwauth,              |
  035-backport, 034-backport-maybe, 033          |
  -backport-maybe, 029-backport-maybe-not        |
Parent ID:  #25925                               |         Points:
 Reviewer:  teor                                 |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by teor):

 Hi juga, arma,

 Nick and I spoke this morning in the patch party meeting.

 He suggested that we deploy sbws first, then make changes to relay
 bandwidth self-tests.
 But if there are critical bugs, we should fix those bugs.

 Core Tor/Tor tickets:

 #22453  Relays should regularly do a larger bandwidth self-test

 We won't know if we need bandwidth self-tests until we deploy sbws. Defer
 this ticket until 0.4.1 or later.

 #28509  Limit relay bandwidth self-tests based on RelayBandwidthRate, not
 BandwidthRate

 This is a fast-fix ticket that has almost no impact

 #28510  When relays reset bandwidth tests, the test waits until the next
 directory document is received

 We won't know if we need bandwidth self-tests until we deploy sbws. Defer
 this ticket until 0.4.1 or later.

 #28511  Limit the number of open testing circuits, and the total number of
 testing circuits

 This is a potential DoS vector which we should fix. One fast fix is simply
 to reduce the rate of testing.

 #28512  Increase NUM_PARALLEL_TESTING_CIRCS to avoid circuit windows

 We won't know if we need bandwidth self-tests until we deploy sbws. Defer
 this ticket until 0.4.1 or later.

 #28514  Open NUM_PARALLEL_TESTING_CIRCS when a bandwidth test is initiated

 We won't know if we need bandwidth self-tests until we deploy sbws. Defer
 this ticket until 0.4.1 or later.

 Core Tor/sbws tickets:

 #28519  Prioritize relays with no measured bandwidth in the consensus

 This is a really important fix to sbws, to make sure all relays are
 measured.

 #28545  Use an 11 second download in sbws

 This change to sbws makes sure that sbws can grow slow relay bandwidths in
 the absence of relay bandwidth self-tests.

 #28547  Monitor relays that are not measured by each sbws instance

 We need to make sure that all relays are measured by sbws, after the
 #28519 fix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22453#comment:37>
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