Mercurial > hg > nginx
view src/event/quic/ngx_event_quic_ack.h @ 9138:a90f79792b5d
QUIC: optimized ACK delay.
Previously ACK was not generated if max_ack_delay was not yet expired and the
number of unacknowledged ack-eliciting packets was less than two, as allowed by
RFC 9000 13.2.1-13.2.2. However this only makes sense to avoid sending ACK-only
packets, as explained by the RFC:
On the other hand, reducing the frequency of packets that carry only
acknowledgments reduces packet transmission and processing cost at both
endpoints.
Now ACK is delayed only if output frame queue is empty. Otherwise ACK is sent
immediately, which significantly improves QUIC performance with certain tests.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Thu, 27 Jul 2023 16:37:17 +0400 |
parents | 4117aa7fa38e |
children |
line wrap: on
line source
/* * Copyright (C) Nginx, Inc. */ #ifndef _NGX_EVENT_QUIC_ACK_H_INCLUDED_ #define _NGX_EVENT_QUIC_ACK_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> ngx_int_t ngx_quic_handle_ack_frame(ngx_connection_t *c, ngx_quic_header_t *pkt, ngx_quic_frame_t *f); void ngx_quic_congestion_ack(ngx_connection_t *c, ngx_quic_frame_t *frame); void ngx_quic_resend_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx); void ngx_quic_set_lost_timer(ngx_connection_t *c); void ngx_quic_pto_handler(ngx_event_t *ev); ngx_msec_t ngx_quic_pto(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx); ngx_int_t ngx_quic_ack_packet(ngx_connection_t *c, ngx_quic_header_t *pkt); ngx_int_t ngx_quic_generate_ack(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx); #endif /* _NGX_EVENT_QUIC_ACK_H_INCLUDED_ */