[tor-bugs] #24425 [Core Tor/DirAuth]: Set the hsdir_spread_store parameter to 4 (or maybe even 5)

Tor Bug Tracker & Wiki blackhole at torproject.org
Wed Nov 29 11:31:31 UTC 2017

#24425: Set the hsdir_spread_store parameter to 4 (or maybe even 5)
 Reporter:  nickm             |          Owner:  (none)
     Type:  enhancement       |         Status:  new
 Priority:  Medium            |      Milestone:  Tor: 0.3.2.x-final
Component:  Core Tor/DirAuth  |        Version:
 Severity:  Normal            |     Resolution:
 Keywords:                    |  Actual Points:
Parent ID:                    |         Points:
 Reviewer:                    |        Sponsor:

Comment (by asn):

 Replying to [comment:4 teor]:
 > If you write down a list of exactly what you want to know, we can
 probably collect some stats on ~18 HSDirs using PrivCount.

 Hey teor,

 I might be hijacking this ticket by suggesting the following stats but
 here are some basic ideas:

 - How many v2/v3/both descs per HSDir?
 - How much total RAM do all v2/v3/both descs occupy on your hsdirs?
 (max,min,avg,mean over your 18 hsdirs)
 - Size variance of v2/v3 descs? (max,min,avg,mean)
 - What's the rate of incoming v2/v3/both descs?
 - How many failed requests for HS descriptors over time? (percentage over
 total requests?)

 These are just the obvious stats that I came up with. We can come up with
 more stuff as we see some results and understand the space better.

 Let me know if you need help in turning the above sentences into

 > We will also need an estimate of how much 1 client / service would
 contribute to each statistic in 10 minutes.

 Is that to figure out the noise for differential privacy? Let's try to
 come up with the final stats list and then we can figure this out.

 Should we make a separate ticket (child of this one) for this task?

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/24425#comment:5>
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