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QUIC: ignore congestion control when sending MTU probes.

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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.
This commit is contained in:
Roman Arutyunyan 2025-01-06 10:19:56 +04:00
parent c0aec46b6e
commit a200288677
1 changed files with 1 additions and 0 deletions
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src/event/quic/ngx_event_quic_migration.c
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@ -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);