[metrics-bugs] #26022 [Metrics/Statistics]: Fix a flaw in the noise-removing code in our onion service statistics
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Wed May 9 13:15:50 UTC 2018
#26022: Fix a flaw in the noise-removing code in our onion service statistics
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Reporter: karsten | Owner: metrics-team
Type: defect | Status: needs_review
Priority: Medium | Milestone:
Component: Metrics/Statistics | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by asn):
Hey Karsten,
nice research! It's been a while since we looked at this stuff, so here
are a
few questions as I try to understand what's going on:
a) I'm trying to understand the rounding step and it's significance. Do
you
remember what we meant by ''The idea is that it's most likely that
noise was
added to the closest right side of a bin than to the right side of
another
bin.''?
b) Why do we think that the result of that division should be floored
towards
infinity? Is it because the graph looks weird?
c) How did you produce that graph? I agree it doesn't look good.
d) You say ''Right now, we're handling all negative reported values wrong
by
adding 1 binSize to them which we shouldn't do.''. Where do we do that,
and
why?
Thanks! :)
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/26022#comment:2>
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