[tor-bugs] #30233 [Core Tor/sbws]: Ask for more bytes in our initial request

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#30233: Ask for more bytes in our initial request
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     Reporter:  teor           |      Owner:  (none)
         Type:  defect         |     Status:  new
     Priority:  Medium         |  Milestone:  sbws: unspecified
    Component:  Core Tor/sbws  |    Version:  sbws: unspecified
     Severity:  Normal         |   Keywords:
Actual Points:                 |  Parent ID:  #30227
       Points:                 |   Reviewer:
      Sponsor:                 |
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 I don't know how we got this figure, but it seems really low:
 {{{
 # The number of bytes to initially request from the server
 initial_read_request = 16384
 }}}

 Let's try to work out something more reasonable:

 RELAY_REQUIRED_MIN_BANDWIDTH is 75 * 1024 = 76800 bytes per second.
 sbws wants measurements to take 6 seconds: 76800 * 6 = 460800.
 (or 76800 * 8 = 614400 after #30231.)

 Downloading 1 MB on the current Tor network takes between 1-8 seconds:
 https://metrics.torproject.org/torperf.html?start=2019-01-18&end=2019-04-18&server=public&filesize=1mb

 And 5 MB takes between 5-30 seconds:
 https://metrics.torproject.org/torperf.html?start=2019-01-18&end=2019-04-18&server=public&filesize=5mb

 Most relays self-reported bandwidth is more than 500 kilobytes per second:
 https://metrics.torproject.org/advbwdist-
 relay.html?start=2019-01-18&end=2019-04-18&n=5000

 So I suggest 1 MB:
 {{{
 # The number of bytes to initially request from the server
 initial_read_request = 1048576
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30233>
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