[tor-dev] Revising Proposal 140

Roger Dingledine arma at mit.edu
Thu May 1 08:17:12 UTC 2014

On Thu, May 01, 2014 at 10:02:30AM +0200, Daniel Martí wrote:
> * Regarding their size, #140 suggests that they are not useful past 16
>   hours. I thought we could compare the compressed size of the diffs
>   when creating them, since they may be of use for a longer time. We
>   could do this relative size limit first as well as the time limit
>   mentioned above.
> That is all that we came up with for now, what do you think? Ideas about
> what might be missing or needing an update are welcome, of course :)

Hypothesis: a good chunk of the new lines are lines that you've already
seen in some recent consensus. That is, they're relays that lost the
Running flag but now they have it again.

Step zero, see to what extent this theory is true in practice.

If it's true a lot, is there something clients can do to take advantage
of this fact? Like, keep several recent consensuses so they already have
the lines they're told to add back in? Or do the numbers work out poorly
here, since the bytes we spend saying "yes, those lines from back then,
the ones that hash to H" eat too much into our savings to warrant the
extra complexity?


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