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annotate auto/have @ 9138:a90f79792b5d

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QUIC: optimized ACK delay. Previously ACK was not generated if max_ack_delay was not yet expired and the number of unacknowledged ack-eliciting packets was less than two, as allowed by RFC 9000 13.2.1-13.2.2. However this only makes sense to avoid sending ACK-only packets, as explained by the RFC: On the other hand, reducing the frequency of packets that carry only acknowledgments reduces packet transmission and processing cost at both endpoints. Now ACK is delayed only if output frame queue is empty. Otherwise ACK is sent immediately, which significantly improves QUIC performance with certain tests.
author Roman Arutyunyan <arut@nginx.com>
date Thu, 27 Jul 2023 16:37:17 +0400
parents d620f497c50f
children
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
parents: 248
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42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
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2 # Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
Maxim Konovalov <maxim@nginx.com>
parents: 444
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3 # Copyright (C) Nginx, Inc.
444
42d11f017717 nginx-0.1.0-2004-09-29-20:00:49 import; remove years from copyright
Igor Sysoev <igor@sysoev.ru>
parents: 248
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e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
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e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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6 cat << END >> $NGX_AUTO_CONFIG_H
e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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8 #ifndef $have
e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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9 #define $have 1
e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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10 #endif
e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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e885208c518b nginx-0.0.2-2004-02-03-00:19:52 import
Igor Sysoev <igor@sysoev.ru>
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12 END