[tor-bugs] #24499 [Core Tor/Torflow]: Bandwidth determination is flawed

Tor Bug Tracker & Wiki blackhole at torproject.org
Sun Dec 3 23:18:35 UTC 2017


#24499: Bandwidth determination is flawed
------------------------------+---------------------
 Reporter:  Hassprediger      |          Owner:  tom
     Type:  defect            |         Status:  new
 Priority:  Medium            |      Milestone:
Component:  Core Tor/Torflow  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:  tor-bwauth        |  Actual Points:
Parent ID:                    |         Points:
 Reviewer:                    |        Sponsor:
------------------------------+---------------------

Comment (by teor):

 Replying to [comment:2 starlight]:
 > Suggest you try removing the relay bandwidth limit.  Even in regions
 favored by the BWAuths, non-exit nodes rarely see more than 30% link
 utilization by Tor.  While the relay may still be rated lower than it
 should, it may acquire enough consensus weight to attract notable traffic.
 One megabit is not much.

 30% is actually considered overloaded in most networks. 10% is good for
 low packet loss and low latency.

 The last time I checked, the relay bandwidth limit was not active on the
 network. Please feel free to double-check, and if there is some limit,
 open another ticket to address that issue.

 > The path selection algorithm seems non-linear w/r/t low-end relays,
 where once one breaks above a certain level traffic goes up rapidly.

 This is probably due to the Guard and Fast flags. If you can find better
 settings, please open another ticket to tune those flags.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24499#comment:3>
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