[tor-bugs] #29720 [Core Tor/sbws]: Consider storing measured bandwidth for both the measured relay and the helper relay

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#29720: Consider storing measured bandwidth for both the measured relay and the
helper relay
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     Reporter:  juga           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: unspecified
    Component:  Core Tor/sbws  |    Version:  sbws: 1.0.5
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:
       Points:  1              |   Reviewer:
      Sponsor:                 |
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 Currently `sbws` store the measurement for the relay that was selected to
 be measured, but probably the measurement should also be stored for the
 helper relay, which would reduce to the half the measurements needed.

 The main difference would be that the helper measurement would be with a
 relay that have the same or half bandwidth instead of with a relay that
 have double or same bandwidth, which might restrict its bandwidth.

 To mitigate this, it could be checked whether it was a helper and then
 measure it next time as the node to measure.

 Different to #28463, though related.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29720>
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