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o Major bugfixes:
- Ignore negative and large timeout values that can happen during a
suspend or hibernate. These values caused various asserts to fire
in the circuit build times code, crashing Tor. Bug 1245, bugfix on
0.2.2.2-alpha.
- Alter calculation of Pareto distribution parameter 'Xm' for Circuit Build
Timeout learning to use the weighted average of the top N=3 modes. This
should improve the timeout calculation in some cases, and prevent
extremely high timeout values. Bug 1335, bugfix on 0.2.2.2-alpha.
- Implement a filtering step to recompute synthetic build times every time
the timeout changes. Additionally, place a lower cap on synthetic build
times, and allow this cap to be controlled by the consensus. This should
also improve the build time calculations, and should eliminate a case
where Tor was allocating an excessive amount of temporary memory during
timeout calculation. Bugs 1335 and 1245, bugfix on 0.2.2.2-alpha.
o Minor bugfixes:
- Eliminate a case where a circuit build time warning was displayed after
network connectivity resumed.
o Minor features:
- Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port event,
to give information on the current rate of circuit timeouts over our
stored history.
- Add ability to disable circuit build time learning via consensus
parameter and via a LearnCircuitBuildTimeout config option. Also
automatically disable circuit build time calculation if we are either
a AuthoritativeDirectory, or if we fail to write our state file. Bug 1296.
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