[tor-bugs] #11327 [Tor]: Dir auths should choose Fast and Guard flags by consensus weight if they don't measure

Tor Bug Tracker & Wiki blackhole at torproject.org
Wed Mar 26 20:48:44 UTC 2014


#11327: Dir auths should choose Fast and Guard flags by consensus weight if they
don't measure
----------------------+------------------------------------
 Reporter:  arma      |          Owner:
     Type:  defect    |         Status:  new
 Priority:  normal    |      Milestone:  Tor: 0.2.6.x-final
Component:  Tor       |        Version:
 Keywords:  tor-auth  |  Actual Points:
Parent ID:            |         Points:
----------------------+------------------------------------
 In #8435 we made directory-authorities-that-run-bwauths stop voting Fast
 or Guard for relays they hadn't measured yet.

 But as I pointed out in
 https://trac.torproject.org/projects/tor/ticket/8435#comment:13, since
 only a minority of dir auths run bwauths, the majority of dir auths are
 still voting Fast and Guard based on descriptor bandwidths.

 So while the title of ticket #8435 says "Ignore advertised bandwidths for
 flags once we have enough measured bandwidths", the ChangeLog entry is
 more accurate:
 {{{
     - Directory authorities that have more than a threshold number
       of relays with measured bandwidths now treat relays with unmeasured
       bandwidths as having bandwidth 0. Resolves ticket 8435.
 }}}

 We should at some point actually do the original goal, which is to give
 Fast to the 7/8s of relays whose consensus weights are highest, and Guard
 to the 1/2 of relays whose consensus weights are highest and who match the
 other guard constraints.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/11327>
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