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[nginx] QUIC: fixed congesion control in GSO mode.

Roman Arutyunyan
August 14, 2023 10:02AM
details: https://hg.nginx.org/nginx/rev/e9a003d40485
changeset: 9140:e9a003d40485
user: Roman Arutyunyan <arut@nginx.com>
date: Thu Jul 27 13:35:42 2023 +0400
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.


src/event/quic/ngx_event_quic_output.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diffs (12 lines):

diff -r d7dec2970161 -r e9a003d40485 src/event/quic/ngx_event_quic_output.c
--- a/src/event/quic/ngx_event_quic_output.c Thu Aug 10 20:11:29 2023 +0400
+++ b/src/event/quic/ngx_event_quic_output.c Thu Jul 27 13:35:42 2023 +0400
@@ -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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[nginx] QUIC: fixed congesion control in GSO mode.

Roman Arutyunyan 226 August 14, 2023 10:02AM

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