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

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#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:            
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Comment(by robgjansen):

 '''__The third stab__'''

 We scaled up our '''network model''' to utilize all of EC2's 68 GiB of
 RAM:

 {{{
 * 400 high bandwidth http file servers
 * 1 high bandwidth torrent/swarm tracker authority
 * 400 relays:
   -160 exits
   -240 non-exits (1 authority)
 * 2600 clients (each download is from a random server):
   -80 im: upload 1 KiB, download 1 KiB, wait (0-5] seconds, repeat
   -2200 web: request and download 320 KiB, wait (0-60] seconds, repeat
   -160 bulk: request and download 5 MiB, repeat
   -80 p2p: from each other p2p client: download and upload 16 KiB, repeat
   -40 torperf 50 KiB: request and download 50 KiB, wait 60 seconds, repeat
   -40 torperf 1 MiB: request and download 1 MiB, wait 60 seconds, repeat
 }}}
 '''Load on the network''' was distributed as follows:

 {{{
 TYPE    #XFERS  GiB     %
 im      30648   0.029   0.065
 web     88069   26.877  59.507
 bulk    1913    9.341   20.681
 p2p     510250  7.786   17.238
 perf50k 1888    0.090   0.199
 perf1m  1068    1.043   2.309
 TOTAL   633836  45.165  100.000
 }}}
 '''TorPerf results''' are shown in
 [https://trac.torproject.org/projects/tor/attachment/ticket/6401/20120802-ec2
 -torperf-combined.pdf the attached graph here].
 '''Client performance''' is shown in
 [https://trac.torproject.org/projects/tor/attachment/ticket/6401/20120802-ec2-combined.pdf
 the attached graph here].

 The load distribution looks good. I still expected shadow client
 performance to be a bit faster, i.e. those dashed lines to move a little
 farther to the left. For now I think this looks good enough to start
 experiments. After all, its the ''relative performance between
 experiments'' thats really more important than ''how well we match
 TorPerf''.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6401#comment:9>
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