[tor-bugs] #24506 [Core Tor/Torflow]: Move some bandwidth authority servers to a CDN

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#24506: Move some bandwidth authority servers to a CDN
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 Reporter:  teor              |          Owner:  tom
     Type:  task              |         Status:  new
 Priority:  Medium            |      Milestone:
Component:  Core Tor/Torflow  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:  tor-bwauth        |  Actual Points:
Parent ID:  #24499            |         Points:
 Reviewer:                    |        Sponsor:
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Changes (by starlight):

 * cc: starlight@… (added)


Comment:

 I'd like to point out a problem with sourcing bandwidth measurement files
 on a CDN.

 CDN's function by placing cached copies of content on servers located
 diversely around the world.  The problem is that some of the CDN servers
 reside in the same physical datacenters as many of the fastest relays in
 the network.  In some cases relays will have 10Gbit local-network
 connectivity to a CDN server hosting the bandwidth files, with sub-
 millisecond round-trip ping latency possibly reaching below 100
 microseconds.

 Therefore serving bandwidth files via CDN will result in unfairly high
 rating biases for co-located relays and unfairly low ratings for relays
 with good connectivity but without close proximity to a CDN cache-server.
 This unfairness will likely be impossible to correct out of bandwidth
 measurement results.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24506#comment:1>
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