[tor-bugs] #1918 [Metrics]: annotate torperf output with paths

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#1918: annotate torperf output with paths
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 Reporter:  arma         |       Owner:  karsten            
     Type:  enhancement  |      Status:  new                
 Priority:  normal       |   Milestone:  Deliverable-Sep2010
Component:  Metrics      |     Version:                     
 Keywords:               |      Parent:  #1766              
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 Torperf's results right now represent the average performance that users
 should expect to see. But part of the problem with the Tor network right
 now is that the variance is high. One component contributing to this
 variance is the fact that different users choose different entry guards.
 It seems clear that Tor network performance is a function of (among other
 things) the entry guards you've picked.

 There's lots of analysis we should do to try to learn more about what
 performance you should expect from having which guards. A prerequisite for
 all of this analysis is knowing which first hop is used in each torperf
 run.

 So we should modify torperf to annotate in its logs what path was chosen
 for that request. (For now, we only really want the first hop; but I bet
 we'll find a good use for knowing the other hops too.)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1918>
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