details:
https://github.com/nginx/nginx/commit/a40cc700238796d6668a461e121f6ffee5066394
branches: master
commit: a40cc700238796d6668a461e121f6ffee5066394
user: Roman Arutyunyan <a...@nginx.com>
date: Mon, 6 Jan 2025 10:19:56 +0400
description:
QUIC: ignore congestion control when sending MTU probes.
If connection is network-limited, MTU probes have little chance of being
sent since congestion window is almost always full. As a result, PMTUD
may not be able to reach the real MTU and the connection may operate with
a reduced MTU. The solution is to ignore the congestion window. This may
lead to a temporary increase in in-flight count beyond congestion window.
---
src/event/quic/ngx_event_quic_migration.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/event/quic/ngx_event_quic_migration.c
b/src/event/quic/ngx_event_quic_migration.c
index 463eeb503..1d914ffd8 100644
--- a/src/event/quic/ngx_event_quic_migration.c
+++ b/src/event/quic/ngx_event_quic_migration.c
@@ -924,6 +924,7 @@ ngx_quic_send_path_mtu_probe(ngx_connection_t *c,
ngx_quic_path_t *path)
frame->level = ssl_encryption_application;
frame->type = NGX_QUIC_FT_PING;
frame->ignore_loss = 1;
+ frame->ignore_congestion = 1;
qc = ngx_quic_get_connection(c);
ctx = ngx_quic_get_send_ctx(qc, ssl_encryption_application);
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