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[or-cvs] r9824: clean up proposal 108 (tor/trunk/doc/spec/proposals)
Date: 2007-03-15 03:26:11 -0400 (Thu, 15 Mar 2007)
New Revision: 9824
clean up proposal 108
--- tor/trunk/doc/spec/proposals/108-mtbf-based-stability.txt 2007-03-15 06:25:00 UTC (rev 9823)
+++ tor/trunk/doc/spec/proposals/108-mtbf-based-stability.txt 2007-03-15 07:26:11 UTC (rev 9824)
@@ -9,28 +9,31 @@
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.
- 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.
- 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.
@@ -40,3 +43,4 @@
take 29 days on its own and discard the year?
Surely somebody has done this kinds of thing before.