[tor-bugs] #8273 [Tor]: Set flag thresholds and flags based on measured bandwidth

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#8273: Set flag thresholds and flags based on measured bandwidth
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 Reporter:  nickm     |          Owner:                    
     Type:  defect    |         Status:  needs_review      
 Priority:  critical  |      Milestone:  Tor: 0.2.4.x-final
Component:  Tor       |        Version:                    
 Keywords:  tor-auth  |         Parent:                    
   Points:            |   Actualpoints:                    
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Comment(by nickm):

 Replying to [comment:14 andrea]:
 > Replying to [comment:2 nickm]:
 > > Quick notes:
 > >   * The "/* Check if we cleared the whole thing and free if so */"
 seems unnecessary.  dirserv_clear_measured_bw_cache will free this
 eventually, right?
 >
 > It saves one extra block of memory for the map itself when it's empty.

 Okay. I don't think this will make a big difference, but it can't hurt to
 leave it in.

  [...]
 > > And a trickier issue:
 > >   * When we have a sufficient number/fraction of nodes with measured
 bandwidth, I think we should stop believing nodes' advertised bandwidths.
 That is, if the number/fraction of measured nodes is high enough, then we
 should *never* call unmeasured nodes Fast, or Guard, or HSDir, or anything
 else that depends on bandwidth.  (Plausible?)
 >
 > That sounds like a good idea potentially; what about other circumstances
 we use the advertised bandwidth?  Should we consider those cases or just
 concern ourselves with the flags?

 I think we should, for this ticket, just look at the flags.  Other users
 of advertised bandwidth can get other tickets if they don't have them
 already.  (Shall we open those tickets as we work on this one?)

 I'll review the changes you mentioned above Friday (I hope); are you okay
 with implementing the "trickier issue" thing here?  Let's talk online and
 open the new tickets together, unless you're feeling psyched to do them
 yourself.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8273#comment:15>
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