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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.
- - Alter calculation of Pareto distribution parameter 'Alpha' to use a
- right censored distribution model. This allows us to remove the synthetic
- timeout generation and instead calculate build timeouts using truncated
- times. Bugs 1245+1335, bugfix on 0.2.2.2-alpha.
- - Keep circuits open (but do not use them) after the circuit timeout for
- up until the time corresponding to the 95th percentile on the Pareto CDF
- or 60 seconds, whichever is greater. This is done to provide better data
- for the new Pareto model. This percentile can be controlled by the
- consensus.
- o Minor bugfixes:
- - Eliminate a case where a circuit build time warning was displayed after
- network connectivity resumed. Bugfix on 0.2.2.2-alpha.
- 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.
- - More gracefully handle corrupt state files, removing asserts in favor
- of saving a backup and resetting state.
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