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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.
145:(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.
644:. 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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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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project, which provided a partial solution with CoDel that has been primarily tested in
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The Linux kernel's packet scheduler is part of the network stack, together with
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1217:"Linux Advanced Routing and Traffic Control HOWTO, Section 9.2.1. pfifo_fast"
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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:
822:. 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
97:. There are several network schedulers available for the different
703:
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395:
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965:"Queuing Disciplines: Order of Packet Transmission and Dropping"
940:"Traffic Control HOWTO: Traditional Elements of Traffic Control"
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since its version 217 changes the default queuing discipline to
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890:"Traffic Control HOWTO: Classless Queuing Disciplines (qdiscs)"
153:(QoS) is the prioritization of traffic based on service class (
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915:"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
27:
Arbiter on a node in packet switching communication network
1054:"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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81:communication network. It manages the sequence of
1078:"Proportional Integral controller Enhanced (PIE)"
818:is the implementation of a network scheduler for
1242:"systemd System and Service Manager: NEWS file"
613:Several of the above have been implemented as
101:, that implement many of the existing network
1338:Note: This template roughly follows the 2012
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8:
1144:"QFQ Linux kernel network scheduler module"
1120:"HTB Linux kernel network scheduler module"
1096:"DRR Linux kernel network scheduler module"
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1267:"Linux kernel 4.1, Section 11. Networking"
410:Proportional Integral controller-Enhanced
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141:, latency and packet loss. Specifically,
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227:CHOose and Kill for unresponsive flows
2038:Knowledge representation and reasoning
837:Statistical time division multiplexing
2063:Philosophy of artificial intelligence
994:"Advanced traffic control - ArchWiki"
45:(first in, first out) data structure.
7:
1382:Energy consumption (Green computing)
1168:"The Linux kernel network scheduler"
2068:Distributed artificial intelligence
1340:ACM Computing Classification System
341:Generalized Random Early Detection
1573:Integrated development environment
25:
2048:Automated planning and scheduling
1578:Software configuration management
256:Common Applications Kept Enhanced
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129:Terminology and responsibilities
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1696:Computational complexity theory
728:of all NICs, by working on the
543:Hierarchical fair-service curve
528:Enhanced Transmission Selection
1480:Network performance evaluation
1:
2339:Network scheduling algorithms
1851:Multimedia information system
1836:Geographic information system
1826:Enterprise information system
1415:Computer systems organization
1289:Cilium documentation web site
1285:"BPF and XDP Reference Guide"
453:Stochastic Fairness Queueing
314:Fair Queuing Controlled Delay
2210:Computational social science
1798:Theoretical computer science
1611:Software development process
1387:Electronic design automation
1372:Very Large Scale Integration
95:network interface controller
85:in the transmit and receive
2033:Natural language processing
1821:Information storage systems
1193:"tc(8) - Linux manual page"
1036:"Heavy-Hitter Filter qdisc"
598:Time Aware Priority Shaper
214:Generic cell rate algorithm
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1949:Human–computer interaction
1919:Intrusion detection system
1831:Social information systems
1816:Database management system
157:) or reserved connection (
29:
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2190:Computational mathematics
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558:Hierarchical Token Bucket
2225:Computational healthcare
2220:Differentiable computing
2139:Graphics processing unit
1558:Domain-specific language
1427:Computational complexity
2200:Computational chemistry
2134:Photograph manipulation
2025:Artificial intelligence
1841:Decision support system
636:of packets causes high
155:Differentiated services
143:active queue management
135:network traffic control
2265:Educational technology
2096:Reinforcement learning
1846:Process control system
1744:Computational geometry
1734:Algorithmic efficiency
1729:Analysis of algorithms
1377:Systems on Chip (SoCs)
793:Berkeley Packet Filter
721:
718:Berkeley Packet Filter
654:random early detection
642:packet delay variation
424:Random early detection
269:Earliest TxTime First
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32:Scheduling (computing)
2329:Linux kernel features
2235:Electronic publishing
2205:Computational biology
2195:Computational physics
2091:Unsupervised learning
2005:Distributed computing
1881:Information retrieval
1788:Mathematical analysis
1778:Mathematical software
1661:Theory of computation
1626:Software construction
1616:Requirements analysis
1494:Software organization
1422:Computer architecture
1392:Hardware acceleration
1357:Printed circuit board
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103:scheduling algorithms
41:Packets queuing in a
40:
1995:Concurrent computing
1967:Ubiquitous computing
1939:Application security
1934:Information security
1763:Discrete mathematics
1739:Randomized algorithm
1691:Computability theory
1669:Model of computation
1641:Software maintenance
1636:Software engineering
1598:Software development
1548:Programming language
1543:Programming paradigm
1460:Network architecture
615:Linux kernel modules
585:Quick Fair Queueing
482:Class-based queueing
439:Stochastic fair Blue
367:Multiqueue Priority
354:Heavy-Hitter Filter
194:Queueing Algorithms
2334:Network performance
2270:Document management
2260:Operations research
2185:Enterprise software
2101:Multi-task learning
2086:Supervised learning
1808:Information systems
1631:Software deployment
1588:Software repository
1442:Real-time computing
1018:"Let them run CAKE"
513:Deficit round robin
497:Credit-Based Shaper
467:Token Bucket Filter
284:First in, first out
195:
159:Integrated services
59:queueing discipline
2053:Search methodology
2000:Parallel computing
1957:Interaction design
1866:Computing platform
1793:Numerical analysis
1783:Information theory
1568:Software framework
1531:Software notations
1470:Network components
1367:Integrated circuit
998:wiki.archlinux.org
974:. October 25, 2006
722:
679:. You can help by
193:
151:Quality of service
139:network congestion
67:queueing algorithm
47:
18:Queuing discipline
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2245:Electronic voting
2175:Quantum Computing
2168:Applied computing
2154:Image compression
1924:Hardware security
1914:Security services
1871:Digital marketing
1651:Open-source model
1563:Modeling language
1475:Network scheduler
1271:kernelnewbies.org
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99:operating systems
51:network scheduler
16:(Redirected from
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1962:Social computing
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2240:Cyberwarfare
1899:Cryptography
1474:
1288:
1279:
1270:
1261:
1250:. Retrieved
1248:. 2015-05-22
1245:
1236:
1225:. Retrieved
1223:. 2012-05-19
1220:
1211:
1200:. Retrieved
1196:
1187:
1176:. Retrieved
1174:. 2012-12-26
1162:
1151:. Retrieved
1138:
1127:. Retrieved
1114:
1103:. Retrieved
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1072:
1061:. Retrieved
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1001:. Retrieved
997:
988:
976:. Retrieved
971:
959:
949:November 24,
947:. Retrieved
943:
934:
924:November 24,
922:. Retrieved
918:
909:
899:November 24,
897:. Retrieved
893:
884:
856:
814:
791:
767:
754:
750:
742:
726:ring buffers
723:
700:Linux kernel
688:October 2018
685:
681:adding to it
676:
628:
612:
299:Fair queuing
189:
184:
180:
179:
168:
132:
119:
107:
66:
62:
58:
54:
50:
48:
2250:Video games
2230:Digital art
1987:Concurrency
1856:Data mining
1768:Probability
1501:Interpreter
862:Bufferbloat
757:, although
749:(short for
630:Bufferbloat
625:Bufferbloat
381:Multiqueue
208:HW Support
2323:Categories
2308:Glossaries
2180:E-commerce
1773:Statistics
1716:Algorithms
1674:Stochastic
1506:Middleware
1362:Peripheral
1252:2015-06-09
1227:2014-09-19
1202:2023-09-11
1178:2013-09-07
1172:kernel.org
1153:2013-09-07
1148:kernel.org
1129:2013-09-07
1124:kernel.org
1105:2013-09-07
1100:kernel.org
1082:kernel.org
1063:2013-09-07
1058:kernel.org
1040:kernel.org
1003:2023-09-11
876:References
786:rxqueuelen
782:txqueuelen
755:pfifo_fast
474:Classless
459:Classless
446:Classless
431:Classless
416:Classless
403:Classless
387:Classless
373:Classless
360:Classless
347:Classless
334:Classless
321:Classless
306:Classless
291:Classless
275:Classless
248:Classless
233:Classless
199:Algorithm
165:Algorithms
2129:Rendering
2124:Animation
1755:computing
1706:Semantics
1397:Processor
1221:lartc.org
978:March 18,
972:tau.ac.il
807:utility.
734:OSI model
710:netfilter
634:buffering
604:Classful
591:Classful
578:Classful
572:Priority
565:Classful
550:Classful
535:Classful
520:Classful
504:Classful
489:Classful
318:FQ-CoDel
185:classless
2288:Category
2116:Graphics
1891:Security
1553:Compiler
1452:Networks
1349:Hardware
1197:man7.org
944:tldp.org
919:tldp.org
894:tldp.org
826:See also
771:ifconfig
763:fq_codel
714:nftables
650:FQ-CoDel
617:and are
370:MQ-PRIO
202:Acronym
181:Classful
69:, is an
2298:Outline
1022:LWN.net
866:OpenWrt
759:systemd
732:of the
730:layer 2
638:latency
601:TAPRIO
384:MULTIQ
331:FQ-PIE
175:latency
171:buffers
123:dropped
89:of the
71:arbiter
716:, and
400:NETEM
245:CoDel
230:CHOKe
87:queues
1701:Logic
1535:tools
968:(PDF)
848:Notes
646:CoDel
575:PRIO
547:HFSC
344:GRED
288:FIFO
260:CAKE
218:GCRA
205:Type
77:in a
73:on a
65:) or
63:qdisc
1533:and
1406:Form
1402:Size
980:2014
951:2013
926:2013
901:2013
820:BSDs
816:ALTQ
801:LLVM
797:eBPF
784:and
774:and
768:The
652:and
640:and
607:Yes
588:QFQ
562:HTB
532:ETS
517:DRR
507:Yes
501:CBS
486:CBQ
471:TBF
456:SFQ
443:SFB
428:RED
413:PIE
390:Yes
376:Yes
357:HHF
278:Yes
272:ETF
161:).
111:flow
93:and
75:node
43:FIFO
683:.
303:FQ
2325::
1404:/
1287:.
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1038:.
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996:.
970:.
942:.
917:.
892:.
805:tc
777:ip
765:.
746:tc
712:,
656:.
648:,
621:.
125:.
113:,
105:.
57:,
49:A
1342:.
1322:e
1315:t
1308:v
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1042:.
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982:.
953:.
928:.
903:.
868:.
720:.
690:)
686:(
61:(
34:.
20:)
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