QoS Challenges for Real Time Traffic

Transcription

1 QoS Challenges for Real Time Traffic [tj] NEAT is funded by the European Union s Horizon 2020 research and innovation programme under grant agreement no

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3 Packets Me You 3

4 Packets Me You 3

5 Packets Me You 3

6 Middleboxes Middlebox Me You 4

7 Middleboxes Middlebox Me You 4

8 Middleboxes Middlebox Me You 4

9 Middleboxes Middlebox Me You 4

10 Per Hop Behaviours Default Forwarding 5

11 Differentiated Services Me You 6

12 Differentiated Services Me You 6

13 Smart Queueing Middlebox Me You 7

14 Smart Queueing Middlebox Me You 7

15 Smart Queueing Middlebox Me You 7

16 Smart Queueing Middlebox Me You 7

17 Per Hop Behaviours Default Forwarding The default PHB has best-effort (BE) forwarding characteristics Expedited Forwarding The EF PHB has the characteristics of low delay, low loss and low jitter. Assured Forwarding Assured forwarding allows the operator to provide assurance of delivery as long as the traffic does not exceed some subscribed rate. 8

18 The IP Type of Service (TOS) Field Type of Service Precedence 9

19 The IP Type of Service (TOS) Field Type of Service Precedence Diff Serv Code Point ECN 9

20 What Happens to Code Points? Generate a set of points to evaluate RFC recommendations Measurement survey Pass/Fail Test on Code Points Verify Code Group Treatment 10

21 DSCP Treatment Pass Drop Bit Bleaching Remark 11

22 Code Points recommended by recent RFC s Which Code Points should we use? draft-ietf-tsvwg-ieee MPLS RFC5127 draft-ietf-tsvwg-diffserv-intercon-14 WebRTC draft-ietf-tsvwg-rtcweb-qos 12

23 Code Points recommended by recent RFC s DF EF (LBE) CS0 CS1 CS2 CS3 CS4 CS5 CS6 AF11 AF12 AF13 AF21 AF22 AF23 AF31 AF32 AF33 AF41 AF42 AF43 21 code points recommended 13

24 Graphs

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28 Awesome! How do I use this? 18

29 Awesome! How do I use this? uint8_t dscp = 0x2e //EF 18

30 Awesome! How do I use this? uint8_t dscp = 0x2e uint8_t ecn = 0; //EF 18

31 Awesome! How do I use this? uint8_t dscp = 0x2e //EF uint8_t ecn = 0; uint8_t tos = dscp << 2 ecn; 18

32 Awesome! How do I use this? uint8_t dscp = 0x2e //EF uint8_t ecn = 0; uint8_t tos = dscp << 2 ecn; if(setsockopt(flow->socket->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { return ERROR; } return OK; 18

33 The NEAT System APP Class 0 APP Class 1 APP Class 2 APP Class 3 APP Class 4 Middleware NEAT APP Support API NEAT APP Support Module USER SCTP/ UDP Userspace Transport SPUD/ UDP Transport Components Exp Mech NEAT User API NEAT Framework Selection Components DIAG & STATS H and S Components Policy Interface NEAT Policy Manager Policy Information Base Characteristic Information Base KERNEL KPI Traditional Socket NEAT Socket NEAT Kernel Module Policy Interface PCAP RAW IP Experimental Mechanisms TCP UDP SCTP SCTP/UDP TCP Minion Experimental Mechanisms IP 19

34 The NEAT User Module NEAT User API USER Diagnostics and Statistics NEAT Framework Components NEAT Selection Components NEAT Transport Components NEAT Policy Components NEAT Signalling and Handover Components Policy Interface KERNEL KPI Traditional Socket NEAT Socket 20

35 NEAT Application APP Class 1 NEAT User API USER KERNEL Userspace Transport SCTP/ UDP Exp Mech Traditional Socket NEAT User Module TCP UDP SCTP 21 IP

36 NEAT Application static struct neat_flow_operations ops; static struct neat_ctx *ctx = NULL; static struct neat_flow *flow = NULL; ctx = neat_init_ctx() flow = neat_new_flow(ctx) prop = NEAT_PROPERTY_UDP_REQUIRED NEAT_PROPERTY_IPV6_REQUIRED; neat_set_property(ctx, flow, &prop) ops.on_writable = on_writable; ops.on_readable = on_readable; ops.on_error = on_error; neat_set_operations(ctx, flow, &ops) neat_open(ctx, flow, argv[argc - 2], argv[argc - 1]) neat_start_event_loop(ctx, NEAT_RUN_DEFAULT); 22

37 NEAT Application static neat_error_code on_writable(struct neat_flow_operations *opcb) { neat_write(opcb->ctx, opcb->flow, buf) return NEAT_OK; } static neat_error_code on_readable(struct neat_flow_operations *opcb) { neat_read(opcb->ctx, opcb->flow, buf) return NEAT_OK; } 23

38 NEAT QoS Setting 24

39 NEAT QoS Setting neat_set_qos(flow->ctx, flow, 0x2e); 24

40 NEAT QoS Setting neat_set_qos(flow->ctx, flow, 0x2e); neat_set_qos(flow->ctx, flow, NEAT_DSCP_EF); 24

41 NEAT QoS Setting neat_set_qos(flow->ctx, flow, 0x2e); neat_set_qos(flow->ctx, flow, NEAT_DSCP_EF); neat_set_qos(flow->ctx, flow, NEAT_QOS_REALTIME_INTERACTIVE_DATA); 24

42 NEAT is funded by the European Union s Horizon 2020 research and innovation programme under grant agreement no