2009-08-25 06:34:29 +02:00
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Filename: 167-params-in-consensus.txt
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Title: Vote on network parameters in consensus
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Author: Roger Dingledine
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Created: 18-Aug-2009
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2009-09-15 05:24:39 +02:00
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Status: Closed
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Implemented-In: 0.2.2
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2009-08-25 06:34:29 +02:00
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0. History
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1. Overview
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Several of our new performance plans involve guessing how to tune
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clients and relays, yet we won't be able to learn whether we guessed
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the right tuning parameters until many people have upgraded. Instead,
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we should have directory authorities vote on the parameters, and teach
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Tors to read the currently recommended values out of the consensus.
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2. Design
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V3 votes should include a new "params" line after the known-flags
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line. It contains key=value pairs, where value is an integer.
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Consensus documents that are generated with a sufficiently new consensus
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method (7?) then include a params line that includes every key listed
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in any vote, and the median value for that key (in case of ties,
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we use the median closer to zero).
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2.1. Planned keys.
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The first planned parameter is "circwindow=101", which is the initial
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circuit packaging window that clients and relays should use. Putting
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it in the consensus will let us perform experiments with different
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values once enough Tors have upgraded -- see proposal 168.
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Later parameters might include a weighting for how much to favor quiet
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circuits over loud circuits in our round-robin algorithm; a weighting
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for how much to prioritize relays over clients if we use an incentive
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scheme like the gold-star design; and what fraction of circuits we
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should throw out from proposal 151.
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2.2. What about non-integers?
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I'm not sure how we would do median on non-integer values. Further,
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I don't have any non-integer values in mind yet. So I say we cross
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that bridge when we get to it.
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