[tor-bugs] #4486 [Analysis]: Research: should N23 actually help in practice?

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Fri Aug 10 19:25:38 UTC 2012


#4486: Research: should N23 actually help in practice?
-------------------------------------+--------------------------------------
 Reporter:  arma                     |          Owner:       
     Type:  task                     |         Status:  new  
 Priority:  normal                   |      Milestone:       
Component:  Analysis                 |        Version:       
 Keywords:  performance flowcontrol  |         Parent:  #4506
   Points:                           |   Actualpoints:       
-------------------------------------+--------------------------------------

Comment(by robgjansen):

 I just uploaded the
 [https://trac.torproject.org/projects/tor/attachment/ticket/4486/20120810-ec2-n23-combined.pdf
 client performance graphs]. You can find the Tor network and client model
 described in[https://trac.torproject.org/projects/tor/ticket/6401 #6401].

 There are 3 simulations here, all done with tor-0.2.3.16-alpha. In the N23
 sims, I merged 0.2.3.16-alpha into arma's n23-2 branch.

 Load distribution in vanilla Tor:

 {{{
 TYPE    #XFERS  GiB     %
 im      34735   0.033   0.075
 web     85779   26.178  59.376
 bulk    1586    7.744   17.565
 p2p     596397  9.100   20.641
 perf50k 1896    0.090   0.205
 perf1m  965     0.942   2.138
 TOTAL   721358  44.088  100.000

 }}}
 Load distribution with !CircuitPriorityHalflife 0, UseN23 1:

 {{{
 TYPE    #XFERS  GiB     %
 im      21581   0.021   0.050
 web     77185   23.555  57.493
 bulk    3323    16.226  39.603
 p2p     42      0.001   0.002
 perf50k 1686    0.080   0.196
 perf1m  1114    1.088   2.655
 TOTAL   104931  40.970  100.000
 }}}
 Load distribution with !CircuitPriorityHalflife 30, UseN23 1:

 {{{
 TYPE    #XFERS  GiB     %
 im      26429   0.025   0.064
 web     73069   22.299  56.764
 bulk    3265    15.942  40.583
 p2p     8       0.000   0.000
 perf50k 1672    0.080   0.203
 perf1m  960     0.938   2.386
 TOTAL   105403  39.284  100.000
 }}}

 We are again seeing problems with the clients, this time with the P2P
 clients. We should really focus on getting things right in #6341 before
 running more experiments here, since that patch is much simpler than this.

 We should definitely re-run this, but I'm posting the current results
 anywway in case they are useful.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4486#comment:14>
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