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tor/changes/1863_bwhist

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Add Maxima lists to bandwidth state. Right now, Tor routers don't save the maxima values from the bw_history_t between sessions. That's no good, since we use those values to determine bandwidth. This code adds a new BWHist.*Maximum set of values to the state file. If they're not present, we estimate them by taking the observed total bandwidth and dividing it by the period length, which provides a lower bound. This should fix bug 1863. I'm calling it a feature.
2011-01-10 20:11:22 +01:00
o Minor features
- Servers now save observed maximum bandwidth throughput rates
to their state file (along with total usage, which was already
saved) so that they can determine their correct estimated
bandwidth on restart. Resolves bug 1863, where Tor servers
would reset their estimated bandwidth to 0 after restarting.
Fix bug when parsing bwhist with unexpected Interval Previously, our state parsing code would fail to parse a bwhist correctly if the Interval was anything other than the default hardcoded 15 minutes. This change makes the parsing less incorrect, though the resulting history array might get strange values in it if the intervals don't match the one we're using. (That is, if stuff was generated in 15 minute intervals, and we read it into an array that expects 30 minute intervals, we're fine, since values can be combined pairwise. But if we generate data at 30 minute intervals and read it into 15 minute intervals, alternating buckets will be empty.) Bugfix on 0.1.1.11-alpha.
2011-01-10 19:06:50 +01:00
o Minor bugfixes
- Fix a bug in banwidth history state parsing that could have been
triggered if a future version of Tor ever changed the timing
granularity at which bandwidth history is measured. Bugfix on
Tor 0.1.1.11-alpha.
On bwhist state load failure, clear dir_read/write hist too
2011-01-10 19:15:51 +01:00
- Correctly clear out dir_read/dir_write history when there is an
error parsing any bw history value from the state file. Bugfix on
Tor 0.2.2.15-alpha.
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