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comparison src/event/quic/ngx_event_quic_ack.c @ 9122:a32905d6fc10

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QUIC: fixed rttvar on subsequent RTT samples (ticket #2505). Previously, computing rttvar used an updated smoothed_rtt value as per RFC 9002, section 5.3, which appears to be specified in a wrong order. A technical errata ID 7539 is reported.
author Sergey Kandaurov <pluknet@nginx.com>
date Mon, 12 Jun 2023 23:38:56 +0400
parents d59277dd3d8c
children a90f79792b5d
comparison
equal deleted inserted replaced
9121:262c01782566 9122:a32905d6fc10
205 205
206 if (qc->min_rtt + ack_delay < latest_rtt) { 206 if (qc->min_rtt + ack_delay < latest_rtt) {
207 adjusted_rtt -= ack_delay; 207 adjusted_rtt -= ack_delay;
208 } 208 }
209 209
210 qc->avg_rtt += (adjusted_rtt >> 3) - (qc->avg_rtt >> 3);
211 rttvar_sample = ngx_abs((ngx_msec_int_t) (qc->avg_rtt - adjusted_rtt)); 210 rttvar_sample = ngx_abs((ngx_msec_int_t) (qc->avg_rtt - adjusted_rtt));
212 qc->rttvar += (rttvar_sample >> 2) - (qc->rttvar >> 2); 211 qc->rttvar += (rttvar_sample >> 2) - (qc->rttvar >> 2);
212 qc->avg_rtt += (adjusted_rtt >> 3) - (qc->avg_rtt >> 3);
213 } 213 }
214 214
215 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0, 215 ngx_log_debug4(NGX_LOG_DEBUG_EVENT, c->log, 0,
216 "quic rtt sample latest:%M min:%M avg:%M var:%M", 216 "quic rtt sample latest:%M min:%M avg:%M var:%M",
217 latest_rtt, qc->min_rtt, qc->avg_rtt, qc->rttvar); 217 latest_rtt, qc->min_rtt, qc->avg_rtt, qc->rttvar);