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Re: [tor-bugs] #6401 [Analysis]: Update Tor network models from CSET paper
#6401: Update Tor network models from CSET paper
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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 second stab__'''
We used the Tor network model as described above, but changed it by
reducing the web clients from 2301 down to 1500, and increasing the P2P
clients from 9 to 50.
'''Load on the network''' was distributed as follows:
{{{
TYPE #XFERS GiB %
im 20320 0.019 0.063
web 63464 19.368 63.073
bulk 1021 4.985 16.235
p2p 374430 5.713 18.606
perf50k 1023 0.049 0.159
perf1m 586 0.572 1.864
TOTAL 460844 30.707 100.000
}}}
'''Client performance''' is shown in
[https://trac.torproject.org/projects/tor/attachment/ticket/6401/20120729-ec2
-torperf-combined.pdf the attached graph here].
The overall load was reduced by about 4 GiB, and the load distribution
looks better (closer to ~40% bulk). I expected shadow client performance
to be a bit faster, i.e. those dashed lines to move a little farther to
the left than they did.
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.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6401#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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