€•°'      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ'/translations/zh_CN/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ'/translations/zh_TW/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ'/translations/it_IT/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ'/translations/ja_JP/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ'/translations/ko_KR/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ'/translations/sp_SP/networking/tcp-thin”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒcomment”“”)”}”(hŒ SPDX-License-Identifier: GPL-2.0”h]”hŒ SPDX-License-Identifier: GPL-2.0”…””}”hh£sbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1h¡hhhžhhŸŒA/var/lib/git/docbuild/linux/Documentation/networking/tcp-thin.rst”h KubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒThin-streams and TCP”h]”hŒThin-streams and TCP”…””}”(hh»hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hh¶hžhhŸh³h KubhŒ	paragraph”“”)”}”(hX£  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.”h]”hX¥  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 TCPâ€™s
dependency on the arrival of new data from the application to trigger
retransmissions effectively through fast retransmit instead of
waiting for long timeouts.”…””}”(hhËhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhÊ)”}”(hX;  After analysing a large number of time-dependent interactive
applications, we have seen that they often produce thin streams
and also stay with this traffic pattern throughout its entire
lifespan. The combination of time-dependency and the fact that the
streams provoke high latencies when using TCP is unfortunate.”h]”hX;  After analysing a large number of time-dependent interactive
applications, we have seen that they often produce thin streams
and also stay with this traffic pattern throughout its entire
lifespan. The combination of time-dependency and the fact that the
streams provoke high latencies when using TCP is unfortunate.”…””}”(hhÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhÊ)”}”(hX  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:”h]”hX  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:”…””}”(hhçhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khh¶hžhubhŒenumerated_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒ;If the stream is thin, fast retransmit on the first dupACK.”h]”hÊ)”}”(hhþh]”hŒ;If the stream is thin, fast retransmit on the first dupACK.”…””}”(hj   hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khhüubah}”(h]”h ]”h"]”h$]”h&]”uh1húhh÷hžhhŸh³h Nubhû)”}”(hŒ9If the stream is thin, do not apply exponential backoff.
”h]”hÊ)”}”(hŒ8If the stream is thin, do not apply exponential backoff.”h]”hŒ8If the stream is thin, do not apply exponential backoff.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1húhh÷hžhhŸh³h Nubeh}”(h]”h ]”h"]”h$]”h&]”Œenumtype”Œarabic”Œprefix”hŒsuffix”Œ)”uh1hõhh¶hžhhŸh³h KubhÊ)”}”(hX4  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.”h]”hX4  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.”…””}”(hj6  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K!hh¶hžhubhÊ)”}”(hX#  Since these mechanisms are targeted at time-dependent applications,
they must be specifically activated by the application using the
TCP_THIN_LINEAR_TIMEOUTS and TCP_THIN_DUPACK IOCTLS or the
tcp_thin_linear_timeouts and tcp_thin_dupack sysctls. Both
modifications are turned off by default.”h]”hX#  Since these mechanisms are targeted at time-dependent applications,
they must be specifically activated by the application using the
TCP_THIN_LINEAR_TIMEOUTS and TCP_THIN_DUPACK IOCTLS or the
tcp_thin_linear_timeouts and tcp_thin_dupack sysctls. Both
modifications are turned off by default.”…””}”(hjD  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K'hh¶hžhubhµ)”}”(hhh]”(hº)”}”(hŒ
References”h]”hŒ
References”…””}”(hjU  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¹hjR  hžhhŸh³h K.ubhÊ)”}”(hŒfMore information on the modifications, as well as a wide range of
experimental data can be found here:”h]”hŒfMore information on the modifications, as well as a wide range of
experimental data can be found here:”…””}”(hjc  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K/hjR  hžhubhÊ)”}”(hŒ"Improving latency for interactive, thin-stream applications over
reliable transport"
http://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file”h]”(hŒZâ€œImproving latency for interactive, thin-stream applications over
reliable transportâ€
”…””}”(hjq  hžhhŸNh NubhŒ	reference”“”)”}”(hŒGhttp://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file”h]”hŒGhttp://simula.no/research/nd/publications/Simula.nd.477/simula_pdf_file”…””}”(hj{  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”Œrefuri”j}  uh1jy  hjq  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1hÉhŸh³h K2hjR  hžhubeh}”(h]”Œ
references”ah ]”h"]”Œ
references”ah$]”h&]”uh1h´hh¶hžhhŸh³h K.ubeh}”(h]”Œthin-streams-and-tcp”ah ]”h"]”Œthin-streams and tcp”ah$]”h&]”uh1h´hhhžhhŸh³h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h³uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¹NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
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