[tor-bugs] #13792 [Tor]: HS statistics for private tor network to gather info on services, clients and relays

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#13792: HS statistics for private tor network to gather info on services, clients
and relays
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     Reporter:  dgoulet  |      Owner:
         Type:  task     |     Status:  new
     Priority:  normal   |  Milestone:
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  tor-hs, SponsorR
Actual Points:           |  Parent ID:
       Points:           |
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Comment (by dgoulet):

 > That's a great start! BTW, are the graphs for the HSDir measurements
 somewhere public? I'm interested to see the variance in the time of
 fetching a descriptor.

 I have one yes but it has few data points for now. I would like one with
 hundreds at least but it takes forever with chutney (because of the
 bootstrap time) so I still have to set an overnight experiment.

 https://people.torproject.org/~dgoulet/hs/hsdir-025.png

 >
 > On the topic of HSDirs, it should now be easy to do #13208 too, right?
 However, I'm not sure how useful this would be in a private network, where
 there is not that big number of relays and also natural churn is not very
 natural

 Very easy yes! We can match in the trace the fetch + store very easily.
 However, as you said, I've never seen that on chutney because well not
 really overloaded :).

 >
 > Also, I noticed that all stats come from clients or hidden services. You
 haven't instrumented the IP or HSDir code itself, right? Do you think that
 would be useful? For example, to check from the IP's PoV the "time from
 receiving ESTABLISH_INTRO to sending INTRO_ESTABLISHED cell back to the
 HS". Are the two clusters visible there too? If yes, it's definitely an IP
 issue.

 Well in a way I did. The "tor_trace_hs_relay_cell_start/done()"
 tracepoint, you see all HS cells. This is how I can match cells going to
 certain intro points from the HS.

 Good idea for a graph! I can definitely do that!

 >
 > Also, maybe #13239 would be a useful experiment. Basically checking the
 performance baseline with 2 preemptive circuits vs 3 preemptive circuits.

 Indeed, with a patch that does both, we can easily graph the differences.

 That's I think one of the beauty of this stats collection, quickly we can
 see if we make progress or not :)

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13792#comment:6>
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