[metrics-bugs] #26673 [Metrics/Onionperf]: Record download times of smaller file sizes from partial completion times

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#26673: Record download times of smaller file sizes from partial completion times
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     Reporter:  karsten            |      Owner:  metrics-team
         Type:  enhancement        |     Status:  assigned
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:                     |   Reviewer:
      Sponsor:                     |
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 In #25774 (and possibly elsewhere) we discussed options to derive download
 times of different file sizes than 50 KiB, 1 MiB, or 5 MiB from partial
 completion times.

 As of now, OnionPerf (like Torperf) records timestamps whenever it
 completes deciles of the requested file size.
 [https://trac.torproject.org/projects/tor/ticket/25774#comment:13 Commit
 13 on #25774] contains a sample graph of partial completion times derived
 from 1 MiB downloads.

 If these partial completion timestamps are as accurate as timestamps for
 completing entire requests, which is something we should find out, let's
 consider switching OnionPerf's download model: it could download a single
 file size, 1 MiB or 5 MiB depending on available bandwidth, and record
 timestamps for 50 KiB, 100 KiB, 200 KiB, 1 MiB, 2 MiB, 5 MiB, and so on.

 This isn't urgent. We decided on #25774 that development and deployment of
 this new feature are out of scope for the current roadmap until Mexico.
 Doesn't hurt to have this ticket, though, and maybe start discussing
 whether this even makes sense.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26673>
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