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authorNick Mathewson <nickm@torproject.org>2018-01-05 16:41:34 -0500
committerNick Mathewson <nickm@torproject.org>2018-01-05 16:41:34 -0500
commit16fd975a82e502418578c81f04894272c4f11826 (patch)
treeda69981d422d50375e7f17e64e4849058a5a234b
parentbbc9ff160e7071b7a2fa9ab200b6496580975b06 (diff)
parentc52d4d9e3454fd0a94cb900dc18516a489441c18 (diff)
downloadtor-16fd975a82e502418578c81f04894272c4f11826.tar.gz
tor-16fd975a82e502418578c81f04894272c4f11826.zip
Merge branch 'maint-0.2.9' into maint-0.3.0
-rw-r--r--changes/ticket246816
-rw-r--r--doc/tor.1.txt3
-rw-r--r--src/or/config.c9
3 files changed, 16 insertions, 2 deletions
diff --git a/changes/ticket24681 b/changes/ticket24681
new file mode 100644
index 0000000000..cc0a42b2e0
--- /dev/null
+++ 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
index 1665cfe947..7ef8920858 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -446,7 +446,8 @@ 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
index 16f189afd6..ea98ddacdc 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -285,7 +285,14 @@ 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"),