[tor-bugs] #8172 [Flashproxy]: Adjust proxy polling interval to maintain desired level of service

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#8172: Adjust proxy polling interval to maintain desired level of service
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 Reporter:  dcf          |          Owner:  dcf
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:     
Component:  Flashproxy   |        Version:     
 Keywords:               |         Parent:     
   Points:               |   Actualpoints:     
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 When #8171 is done, make the facilitator dynamically adjust its `check-
 back-in` times, separately for IPv4 and IPv6, in order to keep a desired
 proxy capacity.

 Let's say that a desired proxy capacity is that an arriving client gets
 proxy service with expected waiting time 2 seconds, given the current
 client arrival rate. Make a reasonable model of proxy arrival (e.g. a
 Poisson process) and tune it so the mean interarrival time is 2 seconds.
 Put a minimum of 10 seconds on it so if there are few proxies we don't ask
 them to check back in 0 seconds.

 Quantize, maybe to one-minute or perhaps geometrically increasing
 intervals, so that you can't exactly calculate the current number of
 proxies from the polling interval.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/8172>
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