[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
Re: [tor-bugs] #16529 [Tor]: stable flag calculation
#16529: stable flag calculation
-----------------------------+-------------------------------
Reporter: cypherpunks | Owner:
Type: defect | Status: needs_information
Priority: minor | Milestone: Tor: 0.2.???
Component: Tor | Version:
Resolution: | Keywords:
Actual Points: | Parent ID:
Points: | Sponsor:
-----------------------------+-------------------------------
Changes (by teor):
* status: new => needs_information
* milestone: => Tor: 0.2.???
Comment:
From torspec/dir-spec.txt:
"Stable" -- A router is 'Stable' if it is active, and either its
Weighted
MTBF is at least the median for known active routers or its Weighted
MTBF
corresponds to at least 7 days. Routers are never called Stable if they
are
running a version of Tor known to drop circuits stupidly.
(0.1.1.10-alpha
through 0.1.1.16-rc are stupid this way.)
To calculate weighted MTBF, compute the weighted mean of the
lengths
of all intervals when the router was observed to be up, weighting
intervals by $\alpha^n$, where $n$ is the amount of time that has
passed since the interval ended, and $\alpha$ is chosen so that
measurements over approximately one month old no longer influence
the
weighted MTBF much.
As far as I understand, the stable flag is awarded after 7 days or 'more
stable than the median', whichever is less. Tor's definition of median is
the low-median, and it uses the MTBF, so the actual threshold would be
2023456 seconds.
Given this definition, is getting the stable flag after 5 days still an
issue?
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16529#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
_______________________________________________
tor-bugs mailing list
tor-bugs@xxxxxxxxxxxxxxxxxxxx
https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-bugs