# HG changeset patch
# User Roman Arutyunyan <a...@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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