commit c52d4d9e3454fd0a94cb900dc18516a489441c18
parent c9b3f6352f68a03b5380db0e459a8cd6407c5603
Author: Nick Mathewson <nickm@torproject.org>
Date: Fri, 5 Jan 2018 16:41:31 -0500
Merge branch 'teor_ticket24681_028' into maint-0.2.9
Diffstat:
3 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/changes/ticket24681 b/changes/ticket24681
@@ -0,0 +1,6 @@
+ o Minor features (fallback directory mirrors):
+ - Make the default DirAuthorityFallbackRate 0.1, so that clients on the
+ public tor network prefer to bootstrap off fallback directory mirrors.
+ This is a follow-up to 24679, which removed weights from the default
+ fallbacks.
+ Implements ticket 24681.
diff --git a/doc/tor.1.txt b/doc/tor.1.txt
@@ -445,7 +445,8 @@ GENERAL OPTIONS
When configured to use both directory authorities and fallback
directories, the directory authorities also work as fallbacks. They are
chosen with their regular weights, multiplied by this number, which
- should be 1.0 or less. (Default: 1.0)
+ should be 1.0 or less. The default is less than 1, to reduce load on
+ authorities. (Default: 0.1)
[[AlternateDirAuthority]] **AlternateDirAuthority** [__nickname__] [**flags**] __address__:__port__ __fingerprint__ +
diff --git a/src/or/config.c b/src/or/config.c
@@ -226,7 +226,14 @@ static config_var_t option_vars_[] = {
VAR("DirReqStatistics", BOOL, DirReqStatistics_option, "1"),
VAR("DirAuthority", LINELIST, DirAuthorities, NULL),
V(DirCache, BOOL, "1"),
- V(DirAuthorityFallbackRate, DOUBLE, "1.0"),
+ /* A DirAuthorityFallbackRate of 0.1 means that 0.5% of clients try an
+ * authority when all fallbacks are up, and 2% try an authority when 25% of
+ * fallbacks are down. (We rebuild the list when 25% of fallbacks are down).
+ *
+ * We want to reduce load on authorities, but keep these two figures within
+ * an order of magnitude, so there isn't too much load shifting to
+ * authorities when fallbacks go down. */
+ V(DirAuthorityFallbackRate, DOUBLE, "0.1"),
V(DisableAllSwap, BOOL, "0"),
V(DisableDebuggerAttachment, BOOL, "1"),
OBSOLETE("DisableIOCP"),
