[tor-bugs] #1854 [Analysis]: Investigate raising the minimum bandwidth for getting the Fast flag

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#1854: Investigate raising the minimum bandwidth for getting the Fast flag
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 Reporter:  arma                       |          Owner:  arma          
     Type:  task                       |         Status:  needs_revision
 Priority:  normal                     |      Milestone:                
Component:  Analysis                   |        Version:                
 Keywords:  performance loadbalancing  |         Parent:                
   Points:                             |   Actualpoints:                
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Changes (by karsten):

  * status:  needs_review => needs_revision


Comment:

 Replying to [comment:22 arma]:
 > Replying to [comment:18 karsten]:
 > > '''Roger''', please note that I assumed you want to cut out relays
 based on consensus weight, not advertised bandwidth.  Please correct me if
 that assumption is wrong.  (Writing the analysis script for consensus
 weights is probably easier, so we could later extend it to advertised
 bandwidth if required.)
 >
 > The Fast and Guard flags look at descriptor bandwidth, not consensus
 bandwidth. So yes, eventually we should do a version of this analysis that
 looks at descriptor bandwidth.

 A version of this analysis that looks at descriptor bandwidth would sort
 relays by advertised bandwidth and cut off the slowest relays based on
 that.  In the graphs, the x axis would say "Minimum advertised bandwidth"
 instead of "Minimum consensus weight", and of course the lines might be
 slightly different.  But everything else would remain the same, including
 how we calculate guard entropy for the "All guards" sub graph.

 We'll mostly have to change `router.bandwidth` to `router.advertised_bw` a
 few times in the code.  Shouldn't be too hard.

 Sathya, do you want to look into this, or shall I?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1854#comment:25>
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