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QoS Challenges for Real Time Traffic
NEAT is funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 644334.
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QoS Challenges for Real Time Traffic [tj] tj@enoti.me NEAT is - - PowerPoint PPT Presentation
QoS Challenges for Real Time Traffic [tj] tj@enoti.me NEAT is - - PowerPoint PPT Presentation
QoS Challenges for Real Time Traffic [tj] tj@enoti.me NEAT is funded by the European Unions Horizon 2020 research and innovation programme under grant agreement no. 644334. 2 Packets Me You 3 Middleboxes Middlebox Me You
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Packets
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Me You
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Middlebox
Middleboxes
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Me You
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Per Hop Behaviours
- Default Forwarding
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Differentiated Services
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Me You
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Middlebox
Smart Queueing
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Me You
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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.
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7 6 5 4 3 |2 1 0
- -------------------+----------
Type of Service |Precedence
The IP Type of Service (TOS) Field
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7 6 5 4 3 |2 1 0
- -------------------+----------
Type of Service |Precedence 7 6 5 4 3 2 |1 0
- -----------------------+------
Diff Serv Code Point |ECN
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What Happens to Code Points?
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- Generate a set of points to evaluate
- RFC recommendations
- Measurement survey
- Pass/Fail Test on Code Points
- Verify Code Group Treatment
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DSCP Treatment
- Pass
- Drop
- Bit Bleaching
- Remark
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Code Points recommended by recent RFC’s
- Which Code Points should we use?
- 80211
- draft-ietf-tsvwg-ieee-802-11
- MPLS
- RFC5127
- draft-ietf-tsvwg-diffserv-intercon-14
- WebRTC
- draft-ietf-tsvwg-rtcweb-qos
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Code Points recommended by recent RFC’s
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CS0 CS1 CS2 CS3 CS4 CS5 CS6 AF31 AF32 AF33 AF41 AF42 AF43 AF11 AF12 AF13 AF21 AF22 AF23 DF EF (LBE)
21 code points recommended
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Graphs
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Awesome! How do I use this?
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uint8_t dscp = 0x2e //EF if(setsockopt(flow->socket->fd, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1) { return ERROR; } return OK; uint8_t ecn = 0; uint8_t tos = dscp << 2 | ecn;
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The NEAT System
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TCP UDP SCTP
APP Class 0 APP Class 1 APP Class 2 APP Class 3
TCP Minion Experimental Mechanisms
Traditional Socket NEAT Socket Middleware NEAT Framework NEAT User API NEAT APP Support API NEAT Policy Manager USER KERNEL Policy Information Base Characteristic Information Base Policy Interface
SCTP/UDP
APP Class 4
PCAP RAW IP Experimental Mechanisms
KPI Selection Components H and S Components NEAT APP Support Module IP
DIAG & STATS
NEAT Kernel Module Policy Interface Transport Components
SCTP/ UDP SPUD/ UDP …
Userspace Transport
Exp Mech
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The NEAT User Module
20 Traditional Socket NEAT Socket NEAT User API USER KERNEL KPI NEAT Framework Components NEAT Selection Components NEAT Policy Components NEAT Transport Components
NEAT Signalling and Handover Components
Diagnostics and Statistics Policy Interface
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NEAT Application
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APP Class 1 Traditional Socket NEAT User Module NEAT User API
SCTP/ UDP Exp Mech …
Userspace Transport USER KERNEL TCP UDP SCTP IP
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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)
- ps.on_writable = on_writable;
- ps.on_readable = on_readable;
- ps.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);
NEAT Application
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NEAT Application
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static neat_error_code
- n_writable(struct neat_flow_operations *opCB)
{ neat_write(opCB->ctx, opCB->flow, buf) return NEAT_OK; } static neat_error_code
- n_readable(struct neat_flow_operations *opCB)
{ neat_read(opCB->ctx, opCB->flow, buf) return NEAT_OK; }
https://github.com/NEAT-project/neat/blob/master/examples/client.c
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NEAT QoS Setting
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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);
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https://www.neat-project.org https://github.com/neat-project/neat
NEAT is funded by the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 644334.