Suggest that instead of removing routers that are not running, we simply remove routers for which we do not have descriptors in dir/server/all. Does this make sense? Geoff On Thu, Jun 12, 2008 at 10:28:41PM +0200, Peter Palfrader wrote: > This is a pretty low hanging fruit and part of the job to make tor > bootstrap faster even if your bandwidth is really small. > > > Filename: xxx-remove-down-routers-from-consensus > Title: Remove routers that are not Running from consensus documents > Version: $Revision$ > Last-Modified: $Date$ > Author: Peter Palfrader > Created: 11-Jun-2008 > Status: Open > > 1. Overview. > > Tor directory authorities hourly vote and agree on a consensus document > which lists all the routers on the network together with some of their > basic properties, like if a router is an exit node, whether it is > stable or whether it is a version 2 directory mirror. > > One of the properties given with each router is the 'Running' flag. > Clients do not use routers that are not listed as running. > > This proposal suggests that routers without the Running flag are not > listed at all. > > 2. Current status > > At a typical bootstrap a client downloads a 140KB consensus, about > 10KB of certificates to verify that consensus, and about 1.6MB of > server descriptors, about half of which it requires before it will > start building circuits. > > Another proposal deals with how to get that huge 1.6MB fraction to > effectively zero (by downloading only individual descriptors, on > demand). Should that get successfully implemented that will leave the > 140KB compressed consensus as a large fraction of what a client needs > to get in order to work. > > About one third of the routers listed in a consensus are not running > and will therefor never be used by clients who use this consensus. > Not listing those routers will safe about 30% to 40% in size. > > 3. Proposed change > > Authority directory servers produce vote documents that include all > the servers they know about, running or not, like they currently > do. In addition these vote documents also state that the authority > supports a new consensus forming method (method number 4). > > If more than two thirds of votes that an authority has received claim > they support method 4 then this new method will be used: The > consensus document is formed like before but a new last step removes > all routers from the listing that are not marked as Running. >
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