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Re: [tor-bugs] #24046 [Core Tor]: Building circuits through Fast (actually) relays

#24046: Building circuits through Fast (actually) relays
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 Reporter:  IgorMitrofanov  |          Owner:  (none)
     Type:  enhancement     |         Status:  new
 Priority:  Medium          |      Milestone:
Component:  Core Tor        |        Version:
 Severity:  Normal          |     Resolution:
 Keywords:                  |  Actual Points:
Parent ID:                  |         Points:
 Reviewer:                  |        Sponsor:
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Comment (by arma):

 Replying to [comment:4 nikita]:
 > So based on the votes, increasing the 100 KB/s threshold won't have much
 effect b/c the measured threshold (which I'm assuming is the 12.5th
 percentile of consensus weight?) is actually below 100 KB/s.

 Yes, correct.

 Though, remember that the measurements are unitless weights. They just
 mean that somebody with a weight of 40 should get less attention than
 somebody with a weight of 60. They *don't* mean that they think the relay
 with a weight of 60 should be able to do 60KBytes/s.

 > A probably impractical suggestion: could something like TorPerf be used
 to decide this threshold? The median *circuit* BW  is around 300 KB/s
 (https://metrics.torproject.org/torperf.html?start=2017-08-01&end=2017-10-30&source=all&server=public&filesize=5mb),
 so having a relay with a lower bandwidth than that will make it very
 likely this relay will be a bottleneck for you.

 In a world where all of the relays are weighted appropriately, raising the
 threshold too much (i.e. discarding too many slower relays) could
 counterintuitively *lower* the median circuit bandwidth, because it would
 shift more load onto the relays that used to be fast, making them less
 fast.

 I think our main problem now is that we are not close enough to this world
 where all of the relays are weighted appropriately.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24046#comment:6>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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