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Add a delta parameter to Vegas.

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This allows us to cap the queue use during steady state. In shadow, this
reduced instances of long circuit queues at relays.
This commit is contained in:
Mike Perry 2022-02-01 15:32:08 +00:00
parent 3a3f111b23
commit a956b20c1d
2 changed files with 28 additions and 2 deletions
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2
src/core/or/congestion_control_st.h
View File

@ -103,6 +103,8 @@ struct vegas_params_t {
uint16_t alpha;
/** The queue use above which we decrement cwnd */
uint16_t beta;
/** The queue use at which we cap cwnd in steady state */
uint16_t delta;
/** Weighted average (percent) between cwnd estimator and
* piecewise estimator. */
uint8_t bdp_mix_pct;

28
src/core/or/congestion_control_vegas.c
View File

@ -29,27 +29,32 @@
#define VEGAS_ALPHA_SBWS_DFLT (2*OUTBUF_CELLS-TLS_RECORD_MAX_CELLS)
#define VEGAS_BETA_SBWS_DFLT (2*OUTBUF_CELLS)
#define VEGAS_GAMMA_SBWS_DFLT (2*OUTBUF_CELLS)
#define VEGAS_DELTA_SBWS_DFLT (4*OUTBUF_CELLS)
/* Exits are three hops, so params are based on 3 outbufs of cells */
#define VEGAS_ALPHA_EXIT_DFLT (3*OUTBUF_CELLS-TLS_RECORD_MAX_CELLS)
#define VEGAS_BETA_EXIT_DFLT (3*OUTBUF_CELLS)
#define VEGAS_GAMMA_EXIT_DFLT (3*OUTBUF_CELLS)
#define VEGAS_DELTA_EXIT_DFLT (5*OUTBUF_CELLS)
/* Onion rends are six hops, so params are based on 6 outbufs of cells */
#define VEGAS_ALPHA_ONION_DFLT (6*OUTBUF_CELLS-TLS_RECORD_MAX_CELLS)
#define VEGAS_BETA_ONION_DFLT (6*OUTBUF_CELLS)
#define VEGAS_GAMMA_ONION_DFLT (6*OUTBUF_CELLS)
#define VEGAS_DELTA_ONION_DFLT (8*OUTBUF_CELLS)
/* Single Onions are three hops, so params are based on 3 outbufs of cells */
#define VEGAS_ALPHA_SOS_DFLT (3*OUTBUF_CELLS-TLS_RECORD_MAX_CELLS)
#define VEGAS_BETA_SOS_DFLT (3*OUTBUF_CELLS)
#define VEGAS_GAMMA_SOS_DFLT (3*OUTBUF_CELLS)
#define VEGAS_DELTA_SOS_DFLT (5*OUTBUF_CELLS)
/* Vanguard Onions are 7 hops (or 8 if both sides use vanguards, but that
* should be rare), so params are based on 7 outbufs of cells */
#define VEGAS_ALPHA_VG_DFLT (7*OUTBUF_CELLS-TLS_RECORD_MAX_CELLS)
#define VEGAS_BETA_VG_DFLT (7*OUTBUF_CELLS)
#define VEGAS_GAMMA_VG_DFLT (7*OUTBUF_CELLS)
#define VEGAS_DELTA_VG_DFLT (9*OUTBUF_CELLS)
#define VEGAS_BDP_MIX_PCT 100
@ -81,48 +86,59 @@ congestion_control_vegas_set_params(congestion_control_t *cc,
{
tor_assert(cc->cc_alg == CC_ALG_VEGAS);
const char *alpha_str = NULL, *beta_str = NULL, *gamma_str = NULL;
int alpha, beta, gamma;
const char *delta_str = NULL;
int alpha, beta, gamma, delta;
switch (path) {
case CC_PATH_SBWS:
alpha_str = "cc_vegas_alpha_sbws";
beta_str = "cc_vegas_beta_sbws";
gamma_str = "cc_vegas_gamma_sbws";
delta_str = "cc_vegas_delta_sbws";
alpha = VEGAS_ALPHA_SBWS_DFLT;
beta = VEGAS_BETA_SBWS_DFLT;
gamma = VEGAS_GAMMA_SBWS_DFLT;
delta = VEGAS_DELTA_SBWS_DFLT;
break;
case CC_PATH_EXIT:
alpha_str = "cc_vegas_alpha_exit";
beta_str = "cc_vegas_beta_exit";
gamma_str = "cc_vegas_gamma_exit";
delta_str = "cc_vegas_delta_exit";
alpha = VEGAS_ALPHA_EXIT_DFLT;
beta = VEGAS_BETA_EXIT_DFLT;
gamma = VEGAS_GAMMA_EXIT_DFLT;
delta = VEGAS_DELTA_EXIT_DFLT;
break;
case CC_PATH_ONION:
alpha_str = "cc_vegas_alpha_onion";
beta_str = "cc_vegas_beta_onion";
gamma_str = "cc_vegas_gamma_onion";
delta_str = "cc_vegas_delta_onion";
alpha = VEGAS_ALPHA_ONION_DFLT;
beta = VEGAS_BETA_ONION_DFLT;
gamma = VEGAS_GAMMA_ONION_DFLT;
delta = VEGAS_DELTA_ONION_DFLT;
break;
case CC_PATH_ONION_SOS:
alpha_str = "cc_vegas_alpha_sos";
beta_str = "cc_vegas_beta_sos";
gamma_str = "cc_vegas_gamma_sos";
delta_str = "cc_vegas_delta_sos";
alpha = VEGAS_ALPHA_SOS_DFLT;
beta = VEGAS_BETA_SOS_DFLT;
gamma = VEGAS_GAMMA_SOS_DFLT;
delta = VEGAS_DELTA_SOS_DFLT;
break;
case CC_PATH_ONION_VG:
alpha_str = "cc_vegas_alpha_vg";
beta_str = "cc_vegas_beta_vg";
gamma_str = "cc_vegas_gamma_vg";
delta_str = "cc_vegas_delta_vg";
alpha = VEGAS_ALPHA_VG_DFLT;
beta = VEGAS_BETA_VG_DFLT;
gamma = VEGAS_GAMMA_VG_DFLT;
delta = VEGAS_DELTA_VG_DFLT;
break;
default:
tor_assert(0);
@ -147,6 +163,12 @@ congestion_control_vegas_set_params(congestion_control_t *cc,
0,
1000);
cc->vegas_params.delta =
networkstatus_get_param(NULL, delta_str,
delta,
0,
INT32_MAX);
cc->vegas_params.bdp_mix_pct =
networkstatus_get_param(NULL, "cc_vegas_bdp_mix",
VEGAS_BDP_MIX_PCT,
@ -216,7 +238,9 @@ congestion_control_vegas_process_sendme(congestion_control_t *cc,
log_info(LD_CIRC, "CC: TOR_VEGAS exiting slow start");
}
} else {
if (queue_use > cc->vegas_params.beta || cc->blocked_chan) {
if (queue_use > cc->vegas_params.delta) {
cc->cwnd = vegas_bdp_mix(cc) + cc->vegas_params.delta - CWND_INC(cc);
} else if (queue_use > cc->vegas_params.beta || cc->blocked_chan) {
cc->cwnd -= CWND_INC(cc);
} else if (queue_use < cc->vegas_params.alpha) {
cc->cwnd += CWND_INC(cc);