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Be more general in calculating expected onion queue processing time

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Now we consider the TAP cells we'll process while draining the NTor
queue, and vice versa.
This commit is contained in:
Roger Dingledine 2013-09-03 22:15:33 -04:00
parent a66791230f
commit a4400952ee
1 changed files with 27 additions and 4 deletions
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31
src/or/onion.c
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@ -49,6 +49,7 @@ TOR_TAILQ_HEAD(onion_queue_head_t, onion_queue_t)
/** Number of entries of each type currently in each element of ol_list[]. */
static int ol_entries[MAX_ONION_HANDSHAKE_TYPE+1];
static int num_ntors_per_tap(void);
static void onion_queue_entry_remove(onion_queue_t *victim);
/* XXXX024 Check lengths vs MAX_ONIONSKIN_{CHALLENGE,REPLY}_LEN.
@ -66,27 +67,49 @@ have_room_for_onionskin(uint16_t type)
const or_options_t *options = get_options();
int num_cpus;
uint64_t tap_usec, ntor_usec;
uint64_t ntor_during_tap_usec, tap_during_ntor_usec;
/* If we've got fewer than 50 entries, we always have room for one more. */
if (ol_entries[type] < 50)
return 1;
num_cpus = get_num_cpus(options);
/* Compute how many microseconds we'd expect to need to clear all
* onionskins in the current queue. */
* onionskins in various combinations of the queues. */
/* How long would it take to process all the TAP cells in the queue? */
tap_usec = estimated_usec_for_onionskins(
ol_entries[ONION_HANDSHAKE_TYPE_TAP],
ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
/* How long would it take to process all the NTor cells in the queue? */
ntor_usec = estimated_usec_for_onionskins(
ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
/* How long would it take to process the tap cells that we expect to
* process while draining the ntor queue? */
tap_during_ntor_usec = estimated_usec_for_onionskins(
MIN(ol_entries[ONION_HANDSHAKE_TYPE_TAP],
ol_entries[ONION_HANDSHAKE_TYPE_NTOR] / num_ntors_per_tap()),
ONION_HANDSHAKE_TYPE_TAP) / num_cpus;
/* How long would it take to process the ntor cells that we expect to
* process while draining the tap queue? */
ntor_during_tap_usec = estimated_usec_for_onionskins(
MIN(ol_entries[ONION_HANDSHAKE_TYPE_NTOR],
ol_entries[ONION_HANDSHAKE_TYPE_TAP] * num_ntors_per_tap()),
ONION_HANDSHAKE_TYPE_NTOR) / num_cpus;
/* See whether that exceeds MaxOnionQueueDelay. If so, we can't queue
* this. */
if (type == ONION_HANDSHAKE_TYPE_NTOR &&
ntor_usec / 1000 > (uint64_t)options->MaxOnionQueueDelay)
(ntor_usec + tap_during_ntor_usec) / 1000 >
(uint64_t)options->MaxOnionQueueDelay)
return 0;
if (type == ONION_HANDSHAKE_TYPE_TAP &&
(tap_usec + ntor_usec) / 1000 > (uint64_t)options->MaxOnionQueueDelay)
(tap_usec + ntor_during_tap_usec) / 1000 >
(uint64_t)options->MaxOnionQueueDelay)
return 0;
#ifdef CURVE25519_ENABLED
@ -173,7 +196,7 @@ static int
num_ntors_per_tap(void)
{
#define DEFAULT_NUM_NTORS_PER_TAP 10
#define MIN_NUM_NTORS_PER_TAP 0
#define MIN_NUM_NTORS_PER_TAP 1
#define MAX_NUM_NTORS_PER_TAP 100000
return networkstatus_get_param(NULL, "NumNTorsPerTAP",