MB-NG%20Technical%20Meeting%2003%20May%2002

1
Task2 Traffic Generation and Measurement
Definitions Pass-1
2
Proposed Agenda

• Load Traffic
• Task 2.1.1 Define Simulated and Background
  Traffic
• Tools
• Control - logging
• Measurement Systems
• What do MB-NG NEED to measure
• Tech and Political
• Task 2.2.1 Define low level Probe Measurements
• Metrics Pragmatic
• Tools
• Control - logging
• Relation to IETF and GGF Network Metrics
• Draft reports
• Next Technical bitsbytes Meeting
• AOB

3
MB NG SuperJANET4 Development Network (22 Mar
02)
WorldCom
SJ4 Dev C-PoP Warrington 12416
OC48/POS-SR-SC
MAN OSM-4GE-WAN-GBIC
Leeds
Gigabit Ethernet 2.5 Gbit POS Access 2.5 Gbit
POS core MPLS Admin. Domains
SJ4 Dev ULCC 12016
SJ4 Dev C-PoP Reading 12416
SJ4 Dev C-PoP London 12416
OC48/POS-SR-SC
OC48/POS-LR-SC
ULCC
WorldCom
WorldCom
Dark Fiber (SSE) POS
4
Defining Background Traffic

• Regular traffic - constant size packet, regular
  spaced in time
• Poisson traffic - constant size, exponential
  spacing to form transient queues
• IETF traffic mix - different sizes and different
  probability of each size sent
• Play back of real traffic patterns generated from
  packet headers pre-recorded from suitable points
  of the production network. This might include
• Video Conference traffic -gt play back -
  rude/crude tools
• UCL real conf playback tool
• Multicast ?
• General traffic captured at edge of a site, e.g.
  Manchester
• Do tests with a gen to see what gets dropped 0.5
  Gbit typical poeak UCL
• Web-bursty traffic web mirror wget
• Need to be able to reproduce traffic so no TCP as
  non-linear. Statistical reproducible OK
• In general UDP best mto understand the net but
  some TCP bground is good too
• Self-Similar
• What about generating MPLS frames??
• Consider UDP TCP flows
• Need ToS / QoS to be set
• How to control
• Start Stop
• measure load as function of time links and
  Queues

5
Defining the Measurements (1)

• Suggested Approach
• What do we need to measure for MB-NG
• How do we analyse it ?
• What do we expect ?
• What does it tell us ?
• NOT defining the measurement matrix link to
  Task5 Policies
• General Conditions include
• IP operation
• MPLS
• QoS/Diffserv
• Apply techniques to understand the performance
  of
• PC-PC
• Routers and (LAN) interconnects
• Development Core useful to know about the GSR
  performance details how do we load it (PC only
  1Gig I/f may be Spirant Dante OC48 kit.
• End-2-end

6
Defining the Measurements (10)

• UDP round-trip latency vs packet size
• Sum of dt/dl transfer rates
• Router performance
• Stack performance
• UDP round-trip histograms
• Indication of network load
• Switching / transport effects spikes
• UDP 1-way delay
• UDP throughput vs Packet size and transmit delay
• Throughput behaviour
• The effect of load on switch/router throughput
• Offered vs achieved throughput
• UDP Packet Loss vs transmit rate and burst size
• Loss rate ( note location of loss)
• Packet loss distribution as function of time
• Packet loss for simulated TCP bursts
• Buffer sizes in the path
• Detect packet re-ordering
• UDP Inter-frame Jitter as function of packet
  transmit spacing

7
Defining the Measurements (11)

• TCP round-trip latency vs Message size
• Sum of dt/dl transfer rates
• (Router performance)
• Stack / protocol performance
• Detect Packet size dependencies
• TCP round-trip histograms
• Indication of network load
• (Switching / transport effects spikes)
• Stack / protocol performance
• TCP throughput vs Message size and transmit delay
• Throughput behaviour cf UDP
• Offered vs achieved throughput
• Packet loss distribution as function of time
  Re-transmit rate
• Loss as func of pkt rate eg keep the data rate
  the same change pkt size multi-streams
• TCP throughput vs Window size / TCP tuning
• TCP throughput vs number of streams
• Stream throughput - benefits
• Packet loss distribution as function of time
  Re-transmit rate
• Effect on Network

8
Next Steps

• Who does what investigation
• Draft reports
• Next Technical bitsbytes Meeting 24 May
  Manchester

Discussion!
Time