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[PATCH 3 of 4] QUIC: fixed congesion control in GSO mode

Roman Arutyunyan
July 27, 2023 08:44AM
# HG changeset patch
# User Roman Arutyunyan <arut@nginx.com>
# Date 1690450542 -14400
# Thu Jul 27 13:35:42 2023 +0400
# Node ID d8a6ec55938e9a4f1a84c825d9c6abe13aa8b791
# Parent 0d12ada84c168c62e9bae847af2725641da583d0
QUIC: fixed congesion control in GSO mode.

In non-GSO mode, a datagram is sent if congestion window is not exceeded by the
time of send. The window could be exceeded by a small amount after the send.
In GSO mode, congestion window was checked in a similar way, but for all
concatenated datagrams as a whole. This could result in exceeding congestion
window by a lot. Now congestion window is checked for every datagram in GSO
mode as well.

diff --git a/src/event/quic/ngx_event_quic_output.c b/src/event/quic/ngx_event_quic_output.c
--- a/src/event/quic/ngx_event_quic_output.c
+++ b/src/event/quic/ngx_event_quic_output.c
@@ -358,7 +358,7 @@ ngx_quic_create_segments(ngx_connection_

len = ngx_min(segsize, (size_t) (end - p));

- if (len && cg->in_flight < cg->window) {
+ if (len && cg->in_flight + (p - dst) < cg->window) {

n = ngx_quic_output_packet(c, ctx, p, len, len);
if (n == NGX_ERROR) {
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Subject Author Views Posted

[PATCH 0 of 4] QUIC performance optimizations

Roman Arutyunyan 292 July 27, 2023 08:44AM

[PATCH 1 of 4] QUIC: optimized ACK delay

Roman Arutyunyan 80 July 27, 2023 08:44AM

Re: [PATCH 1 of 4] QUIC: optimized ACK delay

Sergey Kandaurov 58 August 10, 2023 11:50AM

[PATCH 2 of 4] QUIC: always add ACK frame to the queue head

Roman Arutyunyan 83 July 27, 2023 08:44AM

Re: [PATCH 2 of 4] QUIC: always add ACK frame to the queue head

Sergey Kandaurov 69 August 10, 2023 12:04PM

Re: [PATCH 2 of 4] QUIC: always add ACK frame to the queue head

Vladimir Homutov via nginx-devel 66 August 10, 2023 12:28PM

Re: [PATCH 2 of 4] QUIC: always add ACK frame to the queue head

Sergey Kandaurov 84 August 10, 2023 12:38PM

[PATCH 3 of 4] QUIC: fixed congesion control in GSO mode

Roman Arutyunyan 72 July 27, 2023 08:44AM

Re: [PATCH 3 of 4] QUIC: fixed congesion control in GSO mode

Sergey Kandaurov 60 August 10, 2023 12:22PM

[PATCH 4 of 4] QUIC: use sendmmsg() with GSO

Roman Arutyunyan 72 July 27, 2023 08:44AM



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