[tor-commits] [tor/maint-0.3.1] Make the default DirAuthorityFallbackRate 0.1

[nickm@xxxxxxxxxxxxxx]

commit 30e13716754bc3d991500f5f68eb83a19aea9b11
Author: teor <teor2345@xxxxxxxxx>
Date:   Sat Dec 23 00:00:18 2017 +1100

    Make the default DirAuthorityFallbackRate 0.1
    
    This makes 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.
---
 changes/ticket24681 | 6 ++++++
 doc/tor.1.txt       | 3 ++-
 src/or/config.c     | 9 ++++++++-
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/changes/ticket24681 b/changes/ticket24681
new file mode 100644
index 000000000..cc0a42b2e
--- /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 74915b711..b286a0656 100644
--- a/doc/tor.1.txt
+++ b/doc/tor.1.txt
@@ -432,7 +432,8 @@ 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 557790a81..2a0d091a2 100644
--- a/src/or/config.c
+++ b/src/or/config.c
@@ -225,7 +225,14 @@ 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"),
   V(DisableIOCP,                 BOOL,     "1"),



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