strparser
switchdev
tc-actions-env-rules
+ tcp-thin
.. only:: subproject and html
initiated. This improves retransmission latency for
non-aggressive thin streams, often found to be time-dependent.
For more information on thin streams, see
- Documentation/networking/tcp-thin.txt
+ Documentation/networking/tcp-thin.rst
Default: 0
--- /dev/null
+.. SPDX-License-Identifier: GPL-2.0
+
+====================
+Thin-streams and TCP
+====================
+
+A wide range of Internet-based services that use reliable transport
+protocols display what we call thin-stream properties. This means
+that the application sends data with such a low rate that the
+retransmission mechanisms of the transport protocol are not fully
+effective. In time-dependent scenarios (like online games, control
+systems, stock trading etc.) where the user experience depends
+on the data delivery latency, packet loss can be devastating for
+the service quality. Extreme latencies are caused by TCP's
+dependency on the arrival of new data from the application to trigger
+retransmissions effectively through fast retransmit instead of
+waiting for long timeouts.
+
+After analysing a large number of time-dependent interactive
+applications, we have seen that they often produce thin streams
+and also stay with this traffic pattern throughout its entire
+lifespan. The combination of time-dependency and the fact that the
+streams provoke high latencies when using TCP is unfortunate.
+
+In order to reduce application-layer latency when packets are lost,
+a set of mechanisms has been made, which address these latency issues
+for thin streams. In short, if the kernel detects a thin stream,
+the retransmission mechanisms are modified in the following manner:
+
+1) If the stream is thin, fast retransmit on the first dupACK.
+2) If the stream is thin, do not apply exponential backoff.
+
+These enhancements are applied only if the stream is detected as
+thin. This is accomplished by defining a threshold for the number
+of packets in flight. If there are less than 4 packets in flight,
+fast retransmissions can not be triggered, and the stream is prone
+to experience high retransmission latencies.
+
+Since these mechanisms are targeted at time-dependent applications,
+they must be specifically activated by the application using the
+TCP_THIN_LINEAR_TIMEOUTS and TCP_THIN_DUPACK IOCTLS or the
+tcp_thin_linear_timeouts and tcp_thin_dupack sysctls. Both
+modifications are turned off by default.
+
+References
+==========
+More information on the modifications, as well as a wide range of
+experimental data can be found here:
+
+"Improving latency for interactive, thin-stream applications over
+reliable transport"
+http://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file
+++ /dev/null
-Thin-streams and TCP
-====================
-A wide range of Internet-based services that use reliable transport
-protocols display what we call thin-stream properties. This means
-that the application sends data with such a low rate that the
-retransmission mechanisms of the transport protocol are not fully
-effective. In time-dependent scenarios (like online games, control
-systems, stock trading etc.) where the user experience depends
-on the data delivery latency, packet loss can be devastating for
-the service quality. Extreme latencies are caused by TCP's
-dependency on the arrival of new data from the application to trigger
-retransmissions effectively through fast retransmit instead of
-waiting for long timeouts.
-
-After analysing a large number of time-dependent interactive
-applications, we have seen that they often produce thin streams
-and also stay with this traffic pattern throughout its entire
-lifespan. The combination of time-dependency and the fact that the
-streams provoke high latencies when using TCP is unfortunate.
-
-In order to reduce application-layer latency when packets are lost,
-a set of mechanisms has been made, which address these latency issues
-for thin streams. In short, if the kernel detects a thin stream,
-the retransmission mechanisms are modified in the following manner:
-
-1) If the stream is thin, fast retransmit on the first dupACK.
-2) If the stream is thin, do not apply exponential backoff.
-
-These enhancements are applied only if the stream is detected as
-thin. This is accomplished by defining a threshold for the number
-of packets in flight. If there are less than 4 packets in flight,
-fast retransmissions can not be triggered, and the stream is prone
-to experience high retransmission latencies.
-
-Since these mechanisms are targeted at time-dependent applications,
-they must be specifically activated by the application using the
-TCP_THIN_LINEAR_TIMEOUTS and TCP_THIN_DUPACK IOCTLS or the
-tcp_thin_linear_timeouts and tcp_thin_dupack sysctls. Both
-modifications are turned off by default.
-
-References
-==========
-More information on the modifications, as well as a wide range of
-experimental data can be found here:
-"Improving latency for interactive, thin-stream applications over
-reliable transport"
-http://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file