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BNet: further investigations

BNet: further investigations. • • • •. n. H. Currently investigated structure. n=4 : 16x16. n * (n - 1) / 2 bidirectional connections. TG/BC. n - 1 ports. n - 1 ports. BNet controller. switch n × n. switch n × n. • • • •. n. • • •. n - 1. H: histogrammer TG: event tagger

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BNet: further investigations

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  1. BNet: further investigations Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  2. • • • • n H Currently investigated structure n=4 : 16x16 n * (n - 1) / 2 bidirectional connections TG/BC n - 1 ports n - 1 ports BNet controller switch n × n switch n × n • • • • n • • • n - 1 H: histogrammer TG: event tagger HC: histogram collector BC: scheduler DD: data dispatcher ED: event dispatcher DD/ED DD/HC DD/ED active buffer CNet CNet PNet CNet PNet Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  3. Simulation with SystemC Modules: • event generator • data dispatcher (sender) • histogram collector • tag generator • BNet controller (schedule) • event dispatcher (receiver) • transmitter (data rate, latency) • switches (buffer capacity, max. # of package queue, 4K) Running with 10 switches and 100 end nodes. Simulation takes 1.5 *105 times longer than simulated time. Various statistics (traffic, network load, etc.) Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  4. Some statistic examples single buffers excluded! Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  5. Scheduling strategy • use data channels for meta data • traffic shaping by schedule • calculate schedule in advance • data transfers are triggered at absolut times • requires deterministic behavior of network • delivery control by buffer monitoring • no transfer acknowledge Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  6. Factorisation of 32x32 switch 2 layers of 6 6x6 switches 6-1 6-2 6-3 6-4 6-5 6-6 1-1 1-2 1-3 1-4 1-5 1-6 • • • • 6-1 6-2 6-3 6-4 6-5 6-6 1-1 1-2 1-3 1-4 1-5 1-6 Variance in latency increases! Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  7. Factorisation of 32x32 switch factorized switch 1 factorized switch 2 1 switch 4 switches 2 switches Variance in latency increases! Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  8. Synchronization of senders • Extra time clock distribution (~µs) • or from concentrator (must then be synchronized) The active buffers must have a common clock to start transfers at a given absolut time. Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  9. Broadcast problematic • Broadcast through factorized switches • How to guarantee packet delivery? Broadcast is needed to distribute event tags and schedule start time to all data dispatchers. Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  10. Error detection • How to ensure that all data arrived? • How to recover if not? • Recover from component fail (or removal)? • When emergency? BNet controller gets buffer status from all DD/EDs. These are sent according schedule. Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  11. Network performance measurements IXIA testbed components chassis IXIA 1600T 10 GE load module (traffic generator/analyzer) Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  12. Network performance measurements TALLY: measurement of Force10 E1200 Point to point Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  13. Topics for investigations • Event shaping • Separate meta data transfer system • Addressing/routing schemes • Broadcast • Synchronization • Determinism • Fault tolerance • Real test bed Hans G. Essel, Sergey Linev: CBM - DAQ BNet

  14. Hans G. Essel, Sergey Linev: CBM - DAQ BNet

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