[tor-bugs] #4487 [Analysis]: Research: Does N23 help especially much in cases where the first hop is slow/flaky?

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#4487: Research: Does N23 help especially much in cases where the first hop is
slow/flaky?
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 Reporter:  arma                      |          Owner:     
     Type:  task                      |         Status:  new
 Priority:  normal                    |      Milestone:     
Component:  Analysis                  |        Version:     
 Keywords:  performance, flowcontrol  |         Parent:     
   Points:                            |   Actualpoints:     
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 Once upon a time I thought that using Tor on a modem shouldn't be that bad
 -- the modem is bad, and the Tor network is bad, but the combination of
 them should be dominated by whichever is worse.

 Tor turns out to not work that way in practice: composing a bad first link
 with a bad Tor network yields a way worse experience than can be explained
 by either component by itself.

 My hypothesis is that this crummy experience is due to the same issue that
 N23 aims to address: the fact that our end-to-end flow control needs cells
 to make it through an entire round trip before more cells are sent.

 We should explore N23 simulations in the case where Alice's connection to
 her first hop is flaky (where flaky might be some combination of low
 bandwidth, high latency, and non-trivial packet loss), and for various
 loads on the Tor network side.

 Oh, and we should probably get some control runs where we do the
 simulations with vanilla Tor rather than Tor+N23.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4487>
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