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MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 1 Task2 Traffic Generation and Measurement Definitions Pass-1.

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Presentation on theme: "MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 1 Task2 Traffic Generation and Measurement Definitions Pass-1."— Presentation transcript:

1 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 1 Task2 Traffic Generation and Measurement Definitions Pass-1

2 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 2 Proposed Agenda  Load Traffic  Task Define Simulated and Background Traffic  Tools  Control - logging  Measurement Systems  What do MB-NG NEED to measure Tech and Political  Task Define low level Probe Measurements  Metrics Pragmatic  Tools  Control - logging  Relation to IETF and GGF Network Metrics  Draft reports  Next Technical “bits&bytes” Meeting  AOB

3 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 3 MB – NG SuperJANET4 Development Network (22 Mar 02) Gigabit Ethernet 2.5 Gbit POS Access 2.5 Gbit POS core MPLS Admin. Domains Dark Fiber (SSE) POS WorldCom SuperJANET4 Production Network Leeds SJ4 Dev C-PoP Warrington SJ4 Dev C-PoP London UCL OSM-4GE- WAN-GBIC OSM- 1OC48- POS-SS UCL OSM-4GE- WAN-GBIC MCC OSM-4GE- WAN-GBIC OSM- 1OC48- POS-SS MAN OSM-4GE- WAN-GBIC RAL OSM-4GE- WAN-GBIC OSM- 1OC48- POS-SS RAL OSM-4GE- WAN-GBIC OC48/POS- SR-SC SJ4 Dev ULCC OC48/POS- SR-SC WorldCom SJ4 Dev C-PoP Reading OC48/POS- LR-SC WorldCom ULCC

4 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 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 -> 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  Start and end numbers How to get data from the core routers – eg need PC in the PoP?

5 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 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 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 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  Indication of network load  Behaviour of end system NICs

7 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 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  TCP Protocol behaviour - tcptrace  What are the “burst” lengths  Effect of routers / end system NICs  All this for WRED Wt fair Qing data rate const and ch pkt size – chack how well the routers do the Qing

8 MB - NG MB-NG Technical Meeting 03 May 02 R. Hughes-Jones Manchester 8 Next Steps  Who does what investigation  Draft reports  Next Technical “bits&bytes” Meeting 24 May Manchester Discussion! Time


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