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The network scheduler logic decides which network packet to forward next. The network scheduler is associated with a queuing system, storing the network packets temporarily until they are transmitted. Systems may have a single or multiple queues in which case each may hold the packets of one
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In some cases it may not be possible to schedule all transmissions within the constraints of the system. In these cases the network scheduler is responsible for deciding which traffic to forward and what gets
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for each device separately in terms of number of
Ethernet frames regardless of their size. The Linux kernel's network stack contains several other buffers, which are not managed by the network scheduler.
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queueing disciplines allow the creation of classes, which work like branches on a tree. Rules can then be set to filter packets into each class. Each class can itself have assigned other classful or
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In the course of time, many network queueing disciplines have been developed. Each of these provides specific reordering or dropping of network packets inside various transmit or receive
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smooths the bandwidth requirements of traffic flows by delaying transmission packets when they are queued in bursts. The scheduler decides the timing for the transmitted packets.
134:(AQM) is the selective dropping of queued network packets to achieve the larger goal of preventing excessive network congestion. The scheduler must choose which packets to drop.
633:. Bufferbloat can be addressed by a network scheduler that strategically discards packets to avoid an unnecessarily high buffering backlog. Examples include
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functionality brought by version 4.1 of the Linux kernel in 2015 extends the classic BPF programmable classifiers to eBPF. These can be compiled using the
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The Linux kernel packet scheduler is an integral part of the Linux kernel's network stack and manages the transmit and receive
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162:. Queuing disciplines are commonly used as attempts to compensate for various networking conditions, like reducing the
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queueing discipline. Classless queueing disciplines do not allow adding more queueing disciplines to it.
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initiatives. Network traffic control is an umbrella term for all measures aimed at reducing
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This article is about scheduling in networking. For scheduling in computing generally, see
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for certain classes of network packets, and are generally used as part of QoS measures.
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The Linux kernel's packet scheduler is part of the network stack, together with
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A network scheduler may have responsibility in implementation of specific
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The overall size of all buffers has been the point of critique by the
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Examples of algorithms suitable for managing network traffic include:
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811:. As of OpenBSD version 5.5 ALTQ was replaced by the HFSC scheduler.
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utilities enable system administrators to configure the buffer sizes
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filters can be attached to the packet scheduler's classifiers. The
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954:"Queuing Disciplines: Order of Packet Transmission and Dropping"
929:"Traffic Control HOWTO: Traditional Elements of Traffic Control"
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since its version 217 changes the default queuing discipline to
879:"Traffic Control HOWTO: Classless Queuing Disciplines (qdiscs)"
142:(QoS) is the prioritization of traffic based on service class (
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904:"Traffic Control HOWTO: Components of Linux Traffic Control"
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The packet scheduler is configured using the utility called
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is a phenomenon in packet-switched networks in which excess
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Flow
Queuing with Proportional Integral controller Enhanced
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Arbiter on a node in packet switching communication network
1043:"Network emulator Linux kernel network scheduler module"
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eBPF backend and loaded into a running kernel using the
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70:communication network. It manages the sequence of
1067:"Proportional Integral controller Enhanced (PIE)"
807:is the implementation of a network scheduler for
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1231:"systemd System and Service Manager: NEWS file"
602:Several of the above have been implemented as
90:, that implement many of the existing network
1327:Note: This template roughly follows the 2012
1303:
1133:"QFQ Linux kernel network scheduler module"
1109:"HTB Linux kernel network scheduler module"
1085:"DRR Linux kernel network scheduler module"
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1256:"Linux kernel 4.1, Section 11. Networking"
399:Proportional Integral controller-Enhanced
130:, latency and packet loss. Specifically,
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25:
216:CHOose and Kill for unresponsive flows
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2027:Knowledge representation and reasoning
826:Statistical time-division multiplexing
2052:Philosophy of artificial intelligence
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983:"Advanced traffic control - ArchWiki"
34:(first in, first out) data structure.
1371:Energy consumption (Green computing)
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1157:"The Linux kernel network scheduler"
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2057:Distributed artificial intelligence
1329:ACM Computing Classification System
330:Generalized Random Early Detection
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1562:Integrated development environment
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2037:Automated planning and scheduling
1567:Software configuration management
245:Common Applications Kept Enhanced
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517:Enhanced Transmission Selection
1469:Network performance evaluation
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1825:Geographic information system
1815:Enterprise information system
1404:Computer systems organization
1278:Cilium documentation web site
1274:"BPF and XDP Reference Guide"
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442:Stochastic Fairness Queueing
303:Fair Queuing Controlled Delay
153:
2199:Computational social science
1787:Theoretical computer science
1600:Software development process
1376:Electronic design automation
1361:Very Large Scale Integration
84:network interface controller
74:in the transmit and receive
7:
2022:Natural language processing
1810:Information storage systems
1182:"tc(8) - Linux manual page"
1025:"Heavy-Hitter Filter qdisc"
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587:Time Aware Priority Shaper
203:Generic cell rate algorithm
10:
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1938:Human–computer interaction
1908:Intrusion detection system
1820:Social information systems
1805:Database management system
146:) or reserved connection (
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1416:Computational complexity
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2189:Computational chemistry
2123:Photograph manipulation
2014:Artificial intelligence
1830:Decision support system
625:of packets causes high
144:Differentiated services
132:active queue management
124:network traffic control
2254:Educational technology
2085:Reinforcement learning
1835:Process control system
1733:Computational geometry
1723:Algorithmic efficiency
1718:Analysis of algorithms
1366:Systems on Chip (SoCs)
782:Berkeley Packet Filter
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707:Berkeley Packet Filter
643:random early detection
631:packet delay variation
413:Random early detection
258:Earliest TxTime First
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21:Scheduling (computing)
2318:Linux kernel features
2224:Electronic publishing
2194:Computational biology
2184:Computational physics
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1994:Distributed computing
1870:Information retrieval
1777:Mathematical analysis
1767:Mathematical software
1650:Theory of computation
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1605:Requirements analysis
1483:Software organization
1411:Computer architecture
1381:Hardware acceleration
1346:Printed circuit board
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92:scheduling algorithms
30:Packets queuing in a
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1984:Concurrent computing
1956:Ubiquitous computing
1928:Application security
1923:Information security
1752:Discrete mathematics
1728:Randomized algorithm
1680:Computability theory
1658:Model of computation
1630:Software maintenance
1625:Software engineering
1587:Software development
1537:Programming language
1532:Programming paradigm
1449:Network architecture
604:Linux kernel modules
574:Quick Fair Queueing
471:Class-based queueing
428:Stochastic fair Blue
356:Multiqueue Priority
343:Heavy-Hitter Filter
183:Queueing Algorithms
2323:Network performance
2259:Document management
2249:Operations research
2174:Enterprise software
2090:Multi-task learning
2075:Supervised learning
1797:Information systems
1620:Software deployment
1577:Software repository
1431:Real-time computing
1007:"Let them run CAKE"
502:Deficit round robin
486:Credit-Based Shaper
456:Token Bucket Filter
273:First in, first out
184:
148:Integrated services
48:queueing discipline
2042:Search methodology
1989:Parallel computing
1946:Interaction design
1855:Computing platform
1782:Numerical analysis
1772:Information theory
1557:Software framework
1520:Software notations
1459:Network components
1356:Integrated circuit
987:wiki.archlinux.org
963:. October 25, 2006
711:
668:. You can help by
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140:Quality of service
128:network congestion
56:queueing algorithm
36:
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2234:Electronic voting
2164:Quantum Computing
2157:Applied computing
2143:Image compression
1913:Hardware security
1903:Security services
1860:Digital marketing
1640:Open-source model
1552:Modeling language
1464:Network scheduler
1260:kernelnewbies.org
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1951:Social computing
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1421:Dependability
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2229:Cyberwarfare
1888:Cryptography
1463:
1277:
1268:
1259:
1250:
1239:. Retrieved
1237:. 2015-05-22
1234:
1225:
1214:. Retrieved
1212:. 2012-05-19
1209:
1200:
1189:. Retrieved
1185:
1176:
1165:. Retrieved
1163:. 2012-12-26
1151:
1140:. Retrieved
1127:
1116:. Retrieved
1103:
1092:. Retrieved
1079:
1061:
1050:. Retrieved
1037:
1019:
1001:
990:. Retrieved
986:
977:
965:. Retrieved
960:
948:
938:November 24,
936:. Retrieved
932:
923:
913:November 24,
911:. Retrieved
907:
898:
888:November 24,
886:. Retrieved
882:
873:
845:
803:
780:
756:
743:
739:
731:
715:ring buffers
712:
689:Linux kernel
677:October 2018
674:
670:adding to it
665:
617:
601:
288:Fair queuing
178:
173:
169:
168:
157:
121:
108:
96:
55:
51:
47:
43:
39:
37:
2239:Video games
2219:Digital art
1976:Concurrency
1845:Data mining
1757:Probability
1490:Interpreter
851:Bufferbloat
746:, although
738:(short for
619:Bufferbloat
614:Bufferbloat
370:Multiqueue
197:HW Support
2312:Categories
2297:Glossaries
2169:E-commerce
1762:Statistics
1705:Algorithms
1663:Stochastic
1495:Middleware
1351:Peripheral
1241:2015-06-09
1216:2014-09-19
1191:2023-09-11
1167:2013-09-07
1161:kernel.org
1142:2013-09-07
1137:kernel.org
1118:2013-09-07
1113:kernel.org
1094:2013-09-07
1089:kernel.org
1071:kernel.org
1052:2013-09-07
1047:kernel.org
1029:kernel.org
992:2023-09-11
865:References
775:rxqueuelen
771:txqueuelen
744:pfifo_fast
463:Classless
448:Classless
435:Classless
420:Classless
405:Classless
392:Classless
376:Classless
362:Classless
349:Classless
336:Classless
323:Classless
310:Classless
295:Classless
280:Classless
264:Classless
237:Classless
222:Classless
188:Algorithm
154:Algorithms
2118:Rendering
2113:Animation
1744:computing
1695:Semantics
1386:Processor
1210:lartc.org
967:March 18,
961:tau.ac.il
796:utility.
723:OSI model
699:netfilter
623:buffering
593:Classful
580:Classful
567:Classful
561:Priority
554:Classful
539:Classful
524:Classful
509:Classful
493:Classful
478:Classful
307:FQ-CoDel
174:classless
2277:Category
2105:Graphics
1880:Security
1542:Compiler
1441:Networks
1338:Hardware
1186:man7.org
933:tldp.org
908:tldp.org
883:tldp.org
815:See also
760:ifconfig
752:fq_codel
703:nftables
639:FQ-CoDel
606:and are
359:MQ-PRIO
191:Acronym
170:Classful
58:, is an
2287:Outline
1011:LWN.net
855:OpenWrt
748:systemd
721:of the
719:layer 2
627:latency
590:TAPRIO
373:MULTIQ
320:FQ-PIE
164:latency
160:buffers
112:dropped
78:of the
60:arbiter
705:, and
389:NETEM
234:CoDel
219:CHOKe
76:queues
1690:Logic
1524:tools
957:(PDF)
837:Notes
635:CoDel
564:PRIO
536:HFSC
333:GRED
277:FIFO
249:CAKE
207:GCRA
194:Type
66:in a
62:on a
54:) or
52:qdisc
1522:and
1395:Form
1391:Size
969:2014
940:2013
915:2013
890:2013
809:BSDs
805:ALTQ
790:LLVM
786:eBPF
773:and
763:and
757:The
641:and
629:and
596:Yes
577:QFQ
551:HTB
521:ETS
506:DRR
496:Yes
490:CBS
475:CBQ
460:TBF
445:SFQ
432:SFB
417:RED
402:PIE
379:Yes
365:Yes
346:HHF
267:Yes
261:ETF
150:).
100:flow
82:and
64:node
32:FIFO
672:.
292:FQ
2314::
1393:/
1276:.
1258:.
1233:.
1208:.
1184:.
1159:.
1135:.
1111:.
1087:.
1069:.
1045:.
1027:.
1009:.
985:.
959:.
931:.
906:.
881:.
794:tc
766:ip
754:.
735:tc
701:,
645:.
637:,
610:.
114:.
102:,
94:.
46:,
38:A
1331:.
1311:e
1304:t
1297:v
1280:.
1244:.
1219:.
1194:.
1170:.
1145:.
1121:.
1097:.
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1055:.
1031:.
1013:.
995:.
971:.
942:.
917:.
892:.
857:.
709:.
679:)
675:(
50:(
23:.
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