Raise thresholds for declaring bootstrapping complete.

This patch changes the total serverdesc threshold from 25% to 75%
and the exit threshold from 33% to 50%.  The goal is to make
initially constructed circuits less horrible, and to make initial
less awful (since fetching directory information in parallel with
whatever the user is trying to do can hurt their performance).

Implements ticket 3196.

1 files changed, 9 insertions, 2 deletions

diff --git a/src/or/routerlist.c b/src/or/routerlist.c
index a64b93f3a9..528b30fc46 100644
--- a/src/or/routerlist.c
+++ b/src/or/routerlist.c
@@ -4997,7 +4997,14 @@ update_router_have_minimum_dir_info(void)
   count_usable_descriptors(&num_exit_present, &num_exit_usable,
                            consensus, options, now, options->ExitNodes, 1);
 
-  if (num_present < num_usable/4) {
+/* What fraction of desired server descriptors do we need before we will
+ * build circuits? */
+#define FRACTION_USABLE_NEEDED .75
+/* What fraction of desired _exit_ server descriptors do we need before we
+ * will build circuits? */
+#define FRACTION_EXIT_USABLE_NEEDED .5
+
+  if (num_present < num_usable * FRACTION_USABLE_NEEDED) {
     tor_snprintf(dir_info_status, sizeof(dir_info_status),
                  "We have only %d/%d usable %sdescriptors.",
                  num_present, num_usable, using_md ? "micro" : "");
@@ -5010,7 +5017,7 @@ update_router_have_minimum_dir_info(void)
                  num_present, using_md ? "micro" : "", num_present ? "" : "s");
     res = 0;
     goto done;
-  } else if (num_exit_present < num_exit_usable / 3) {
+  } else if (num_exit_present < num_exit_usable * FRACTION_EXIT_USABLE_NEEDED) {
     tor_snprintf(dir_info_status, sizeof(dir_info_status),
                  "We have only %d/%d usable exit node descriptors.",
                  num_exit_present, num_exit_usable);