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| author | Nick Mathewson <nickm@torproject.org> | 2008-06-13 22:18:21 +0000 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2008-06-13 22:18:21 +0000 |
| commit | e544931b4f3bdf876b6620b5617a450762a2689b (patch) | |
| tree | 41218b451fbbba3c820ed2c2946e2d3573870ec1 /proposals/ideas | |
| parent | 25a25160c8ec6751bfed47aa956e4e357ae76ae5 (diff) | |
| download | torspec-e544931b4f3bdf876b6620b5617a450762a2689b.tar.gz torspec-e544931b4f3bdf876b6620b5617a450762a2689b.zip | |
More clarifications to xxx-geoip-survey-plan.txt.
svn:r15234
Diffstat (limited to 'proposals/ideas')
| -rw-r--r-- | proposals/ideas/xxx-geoip-survey-plan.txt | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/proposals/ideas/xxx-geoip-survey-plan.txt b/proposals/ideas/xxx-geoip-survey-plan.txt index 121d60f..9d85225 100644 --- a/proposals/ideas/xxx-geoip-survey-plan.txt +++ b/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: |