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| author | Sergey Kandaurov <pluknet@nginx.com> | 2025-04-25 23:32:24 +0400 |
|---|---|---|
| committer | pluknet <pluknet@nginx.com> | 2025-04-29 19:53:41 +0400 |
| commit | f3542500b6d74e3e88fc84b88144afe67882d1fa (patch) | |
| tree | a4a1d9d751ce79d4432a669a886206419de7618c /auto/init | |
| parent | adda7041582d8565ee1e5e7dfe740db85398e1ce (diff) | |
| download | nginx-master.tar.gz nginx-master.zip | |
Previously, it was not possible to send acknowledgments if the
congestion window was limited or temporarily exceeded, such as
after sending a large response or MTU probe. If ACKs were not
received from the peer for some reason to update the in-flight
bytes counter below the congestion window, this might result in
a stalled connection.
The fix is to send ACKs regardless of congestion control. This
meets RFC 9002, Section 7:
: Similar to TCP, packets containing only ACK frames do not count
: toward bytes in flight and are not congestion controlled.
This is a simplified implementation to send ACK frames from the
head of the queue. This was made possible after 6f5f17358.
Reported in trac ticket #2621 and subsequently by Vladimir Homutov:
https://mailman.nginx.org/pipermail/nginx-devel/2025-April/ZKBAWRJVQXSZ2ISG3YJAF3EWMDRDHCMO.html
Diffstat (limited to 'auto/init')
0 files changed, 0 insertions, 0 deletions