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| author | Roger Dingledine <arma@torproject.org> | 2007-03-15 07:26:11 +0000 |
|---|---|---|
| committer | Roger Dingledine <arma@torproject.org> | 2007-03-15 07:26:11 +0000 |
| commit | 70cbe9f180b6a962cff9922c3c66c41db8005b14 (patch) | |
| tree | c1a71c8662e9fcab989254576b5c9dd68ef46037 /proposals/108-mtbf-based-stability.txt | |
| parent | 353c1271896280303adc467920d6e2fd893e3c82 (diff) | |
| download | torspec-70cbe9f180b6a962cff9922c3c66c41db8005b14.tar.gz torspec-70cbe9f180b6a962cff9922c3c66c41db8005b14.zip | |
clean up proposal 108
svn:r9824
Diffstat (limited to 'proposals/108-mtbf-based-stability.txt')
| -rw-r--r-- | proposals/108-mtbf-based-stability.txt | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/proposals/108-mtbf-based-stability.txt b/proposals/108-mtbf-based-stability.txt index 0e11912..0023df0 100644 --- a/proposals/108-mtbf-based-stability.txt +++ b/proposals/108-mtbf-based-stability.txt @@ -9,28 +9,31 @@ Status: Open Overview: This document proposes that we change how directory authorities set the - stability flag from inspection of routers declared Uptime to the + stability flag from inspection of a router's declared Uptime to the authorities' perceived mean time between failure for the router. Motivation: - Clients prefer nodes that the authorities call Stable. This flags are (as - of 0.2.0.0-alpha-dev) set entirely based on the nodes' declared values for + Clients prefer nodes that the authorities call Stable. This flag is (as + of 0.2.0.0-alpha-dev) set entirely based on the node's declared value for uptime. This creates an opportunity for malicious nodes to declare falsely high uptimes in order to get more traffic. Spec changes: - Instead of setting the current rule for setting the Stable flag: + Replace the current rule for setting the Stable flag with: - "An authority should call a server Stable if its observed MTBF for - the past month is at or above the median MTBF for Valid servers. + "Stable" -- A router is 'Stable' if it is active and its observed MTBF + for the past month is at or above the median MTBF for active routers. + Routers are never called stable if they are running a version of Tor + known to drop circuits stupidly. (0.1.1.10-alpha through 0.1.1.16-rc + are stupid this way.) MTBF shall be defined as the mean length of the runs observed by a given directory authority. A run begins when an authority decides that the server is Running, and ends when the authority decides that the server is not Running. In-progress runs are counted when - measuring MTBF." + measuring MTBF. Issues: @@ -40,3 +43,4 @@ Issues: take 29 days on its own and discard the year? Surely somebody has done this kinds of thing before. + |