From: Nick Mathewson Date: Fri, 13 Jun 2008 22:18:21 +0000 (+0000) Subject: More clarifications to xxx-geoip-survey-plan.txt. X-Git-Tag: tor-0.2.1.2-alpha~43 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1913364dc82555f2eca964a7e88f2b0922c7fbe9;p=thirdparty%2Ftor.git More clarifications to xxx-geoip-survey-plan.txt. svn:r15234 --- diff --git a/doc/spec/proposals/ideas/xxx-geoip-survey-plan.txt b/doc/spec/proposals/ideas/xxx-geoip-survey-plan.txt index 121d60f27e..9d852252f0 100644 --- a/doc/spec/proposals/ideas/xxx-geoip-survey-plan.txt +++ b/doc/spec/proposals/ideas/xxx-geoip-survey-plan.txt @@ -26,7 +26,7 @@ Motivation Goals - We want to know about how many Tor users there are, and which + We want to know approximately how many Tor users there are, and which countries they're in, even in the presence of a hypothetical "directory guard" feature. Some uncertainty is okay, but we'd like to be able to put a bound on the uncertainty. @@ -49,7 +49,7 @@ Methods for curent clients: [In both of the above cases, clients choose a running directory cache at random with odds roughly proportional to - its bandwidth.] + its bandwidth. If they're just starting, they know a ] - In some future version, clients will choose directory caches to serve as their "directory guards" to avoid profiling @@ -82,15 +82,21 @@ Methods for curent clients: Notes: - [Over H hours, the N for V2 clients is 2*H, and the N for V3 - clients is currently around N/2 or N/3. [***FIGURE THIS - OUT***XXXX]] + clients is currently around N/2 or N/3.] - (We should only count requests that we actually intend to answer; 503 requests shouldn't count.) - - These measurements *shouldn't* be taken at directory - authorities: their picture of the network is too skewed by the - special cases in which clients fetch from them directly. + - These measurements should also be be taken at a directory + authority if possible: their picture of the network is skewed + by clients that fetch from them directly. These clients, + however, are all the clients that are just bootstrapping + (assuming that the fallback-consensus feature isn't yet used + much). + + - These measurements also overestimate the V2 download rate if + some downloads fail and clients retry them later after backing + off. Methods for directory guards: