[tor-bugs] #24674 [Core Tor/Torflow]: Bandwidth authorities should use geographically distributed bandwidth servers

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#24674: Bandwidth authorities should use geographically distributed bandwidth
servers
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     Reporter:  teor              |      Owner:  tom
         Type:  task              |     Status:  new
     Priority:  Medium            |  Milestone:
    Component:  Core Tor/Torflow  |    Version:
     Severity:  Normal            |   Keywords:  tor-bwauth
Actual Points:                    |  Parent ID:  #24499
       Points:  3                 |   Reviewer:
      Sponsor:                    |
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 When a bandwidth authority is configured with a nearby bandwidth server,
 it measures nearby relays really high.

 Its measurements for those relays don't help "to balance load across the
 network such that a user can expect to have the same average stream
 capacity regardless of path".
 ​https://gitweb.torproject.org/torflow.git/tree/NetworkScanners/BwAuthority/README.spec.txt#n353

 Instead, bandwidth authorities should use a geographically distributed set
 of bandwidth servers. We can do this by:
 * each operator setting up their own set of geographically distributed
 bandwidth servers
 * using one or more CDNs (#24506)
 * sharing the current bandwidth servers between bandwidth authorities

 Ideally, every bandwidth authority would use the same set of bandwidth
 servers. That would eliminate one source of bias.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24674>
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