Feat/tm examples docs - #29
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Mingyumaz merged 4 commits intoAug 31, 2026
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The document doc/traffic-manager.md is solid and cleanly : ) |
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Saturating UDP flow through the VOQ+fabric datapath with the switch egress port as the sole bottleneck (ingress link kept fast so the queue-less host NIC never limits). Measures goodput vs line rate. Results: 100Mbps egress -> 97.13%, 1Gbps egress -> 97.09% of line (both at the Ethernet/IP/UDP header-overhead ceiling ~97.1%), 0 drops, TM forwards 100% of offered load. Confirms the event-driven, completion-paced egress has no artificial timer bottleneck. One egress rate per invocation (bmv2 boots once per process): ./ns3 run "p4-voq-fabric-throughput --linkRate=100Mbps" ./ns3 run "p4-voq-fabric-throughput --linkRate=1000Mbps"
Design/validation doc for the Traffic Manager: VOQ -> fabric -> strict-priority egress datapath, completion-driven egress + channel model, the attribute/stats/drop-reason surface, and captured results from the unit suite, the integration example, and the throughput benchmark (near line rate at 100M/1G, zero internal drops).
Two UDP flows from separate sender hosts converge on one receiver through the qos P4 program; HIGH (prio 3) and LOW (prio 1) contend at a shared oversubscribed output port. Strict priority protects HIGH at ~96% of its offered load while LOW is squeezed to the leftover capacity and the excess is dropped from the low-priority queue. Flows enter on separate ingress ports so each has its own VOQ and the contention is resolved inside the switch (not at a shared host NIC). Adds flowtable_priority.txt (3-host qos table) and folds the demo's validated output into doc/traffic-manager.md.
…p reason Reflect the completion-driven egress fix: NotifyEgressTxComplete() now accounts for each frame by TmTxOutcome (transmitted / dropped / recirculated) rather than counting every dequeued frame as transmitted. Add the totalRecirculated counter and the EGRESS_POST_DEQUEUE_DROP drop reason to the statistics section, and bump dropsByReason to [6]. Signed-off-by: Vineet1101 <vineetgoel692@gmail.com>
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