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[tor-bugs] #27346 [Core Tor/sbws]: Improve sbws bandwidth accuracy
#27346: Improve sbws bandwidth accuracy
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Reporter: teor | Owner: (none)
Type: defect | Status: new
Priority: Medium | Milestone: sbws 1.0 (MVP nice)
Component: Core Tor/sbws | Version:
Severity: Normal | Keywords:
Actual Points: | Parent ID: #27338
Points: | Reviewer:
Sponsor: |
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Better designs SHOULD:
* use at least 4 measurements that are at least 6 hours apart, because:
- there is a daily cycle
- each day contains 2 similar points in the cycle (it is an up and down
cycle)
- if all 4 measurements happen within a few hours, they will still be
biased
* use at least 3 days of observed bandwidths, because:
- a single download at the changeover point can affect 2 days
* weight bandwidths based on the time since the last bandwidth, because:
- if we only record bandwidths when they change, bandwidths that are
updated soon after the last bandwidth are weighted too high
- we can either:
* record the bandwidths every hour, even if they haven't changed
* weight each bandwidth by the time since the last bandwidth
* use a decaying average for measured and observed bandwidths, because:
- recent bandwidths are closer to the relay's current capacity
- and we want accurate results
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27346>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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