commit ac1a78b977596d82138faeecd53e3cf371cbea1d Author: Mike Perry <mikeperry-git@torproject.org> Date: Wed Jan 31 17:07:07 2018 +0000 Bug 24769: Reduce and parameterize the max number of cbt circs. Setting the default for this at 10 and the learning timeout to 3 minutes means we will complete our cbt learning in 30 minutes, which is under the reduced padding connection timeout window. --- src/or/circuituse.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/src/or/circuituse.c b/src/or/circuituse.c index 3a14a3ccf..215ff0d97 100644 --- a/src/or/circuituse.c +++ b/src/or/circuituse.c @@ -1179,15 +1179,11 @@ needs_hs_client_circuits(time_t now, int *needs_uptime, int *needs_capacity, router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN); } -/* The minimum number of open slots we should keep in order to preemptively - * build circuits. */ -#define CBT_MIN_REMAINING_PREEMPTIVE_CIRCUITS 2 - -/* Check to see if we need more circuits to have a good build timeout. However, - * leave a couple slots open so that we can still build circuits preemptively - * as needed. */ -#define CBT_MAX_UNUSED_OPEN_CIRCUITS (MAX_UNUSED_OPEN_CIRCUITS - \ - CBT_MIN_REMAINING_PREEMPTIVE_CIRCUITS) +/* This is how many circuits can be opened concurrently during the cbt learning + * phase. This number cannot exceed the tor-wide MAX_UNUSED_OPEN_CIRCUITS. */ +#define DFLT_CBT_UNUSED_OPEN_CIRCS (10) +#define MIN_CBT_UNUSED_OPEN_CIRCS 0 +#define MAX_CBT_UNUSED_OPEN_CIRCS MAX_UNUSED_OPEN_CIRCUITS /* Return true if we need more circuits for a good build timeout. * XXXX make the assumption that build timeout streams should be @@ -1196,7 +1192,10 @@ STATIC int needs_circuits_for_build(int num) { if (router_have_consensus_path() != CONSENSUS_PATH_UNKNOWN) { - if (num < CBT_MAX_UNUSED_OPEN_CIRCUITS && + if (num < networkstatus_get_param(NULL, "cbtmaxopencircs", + DFLT_CBT_UNUSED_OPEN_CIRCS, + MIN_CBT_UNUSED_OPEN_CIRCS, + MAX_CBT_UNUSED_OPEN_CIRCS) && !circuit_build_times_disabled(get_options()) && circuit_build_times_needs_circuits_now(get_circuit_build_times())) { return 1;