ISG 1 second or above intermittent spike in the TX BW

[romel mathew]

Hello All, 

 I am using TREX in Cisco modeling labs, connecting to TREX using Stateless UI. 

I noticed that, if the ISG(Inter stream gap) is 1 second or above, i see a  spike in TX bandwidth every 30 to 40 seconds. 

The spike becomes more frequent if i increase the ISG and it goes away if the reduce the ISG closer to 0. 

The behaviour is same if i import a pcap or manually create multiple streams. 

May i know if this is an expected behavior and what is causing this?

[hanoh haim]

Hi Romel,

Can you share the full profile? I would try the python profile for testing this

thanks

Hanoh

[romel mathew]

Hi Hanoh, i privately shared the info, sharing it again here. 

May i know if anyone else in this group have noticed this behaviour?

---
- name: "packet_1"
  next: "packet_2"
  stream:
    action_count: 0
    enabled: true
    flags: 0
    flow_stats:
      enabled: false
      stream_id: 0
    isg: 1000000.0
    mode:
      rate:
        type: "pps"
        value: 1.0
      type: "single_burst"
      total_pkts: 100
      pkts_per_burst: 0
      ibg: 0.0
      count: 1
   
    packet:
      binary: "4F+5aekiABUXp3WjCABFAAAqDrQAAIARAQgVAAACFgAABicQJxAAFu5oPGJpbmFyeT48YmluYXJ5Pg=="
      meta: ""
      model: "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"
    self_start: true
    advanced_mode: true
    vm:
      instructions: []
      cache: 1000
  stream_id: 0
- name: "packet_2"
  next: "packet_3"
  stream:
    action_count: 0
    enabled: true
    flags: 0
    flow_stats:
      enabled: false
      stream_id: 0
    isg: 1000000.0
    mode:
      rate:
        type: "pps"
        value: 1.0
      type: "single_burst"
      total_pkts: 100
      pkts_per_burst: 0
      ibg: 0.0
      count: 1
   
    packet:
      binary: "4F+5aekiABUXp3WjCABFAAAqDrUAAIARAQcVAAACFgAABicQJxAAFleGPGJpbmFyeT48YmluYXJ5Pg=="
      meta: ""
      model: "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"
    self_start: false
    advanced_mode: true
    vm:
      instructions: []
      cache: 1000
  stream_id: 0
- name: "packet_3"
  next: "packet_1"
  stream:
    action_count: 0
    enabled: true
    flags: 0
    flow_stats:
      enabled: false
      stream_id: 0
    isg: 1000000.0
    mode:
      rate:
        type: "pps"
        value: 1.0
      type: "single_burst"
      total_pkts: 100
      pkts_per_burst: 0
      ibg: 0.0
      count: 1
   
    packet:
      binary: "ABUXp3Wj4F+5aekiCABFAAAqDrUAAH4RAwcWAAAGFQAAAicQJxAAFkHZPGJpbmFyeT50dzA/"
      meta: ""
      model: "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"
    self_start: false
    advanced_mode: true
    vm:
      instructions: []
      cache: 1000
  stream_id: 0