[tor-bugs] #6401 [Analysis]: Update Tor network models from CSET paper

[Tor Bug Tracker & Wiki]

#6401: Update Tor network models from CSET paper
----------------------------------------------------+-----------------------
 Reporter:  robgjansen                              |          Owner:  robgjansen
     Type:  task                                    |         Status:  new       
 Priority:  normal                                  |      Milestone:            
Component:  Analysis                                |        Version:            
 Keywords:  simulation, performance, network model  |         Parent:            
   Points:                                          |   Actualpoints:            
----------------------------------------------------+-----------------------

Comment(by robgjansen):

 Replying to [comment:7 robgjansen]:

 > I noticed the gap between TorPerf and Shadow seems to expand with the
 download length. Intuition tells me that either Shadow is miscalculating
 packet delays somewhere, or our latency model changed (or was off in the
 first place). Though I continue to be impressed with Shadow's accuracy
 here in the face of so many things that could go wrong.
 >
 > I'm going to review Shadow's packet code and perhaps run one more
 experiment here.

 I analyzed the Shadow code and tested a change that I thought may be the
 culprit, but the results were not significantly different than the
 previously reported.

 Also, the most recent network setup uses only 42 GiB of RAM. Our EC2
 instance has 68 GiB available, so I am now scaling up the network
 slightly. I'm hoping to be able to launch a series of real experiments by
 the end of the week. Roger, Nick Hopper, and I can then poke holes in the
 results some time during Usenix Security next week.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6401#comment:8>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online