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KM3Net Project

KM3Net Project. mmendez@sevensols.com emilio@sevensols.com. Broadcast Source code. The customized SW for KM3net demonstrator is already in the repository . . There is a Manual to start playing with it easily. Scripts to compile the code and configure the switch.

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KM3Net Project

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  1. KM3Net Project mmendez@sevensols.com emilio@sevensols.com

  2. BroadcastSourcecode • The customized SW for KM3net demonstrator is already in the repository. • There is a Manual to start playing with it easily. • Scripts to compile the code and configure the switch. • Waiting for feedback from KM3net community

  3. Pause Frame. • We are working in the pause frame right now. • The TX is ready (Level 1 switch). • The Rx is specified (Broadcast switch). • Here is where we are.

  4. Pause Frame • Who triggers the TxPause Frame? • The Tx PF is sent by the WR Level 1. The Tx Pause frame follows this path: Level 1->Level 2->Broadcast->DOM

  5. Pause Frame • About Peter questions: • Why are we using the endpoint Rx buffers? • There is not a higher level queues? • The usual packet path is EndpointX->SWCore->EndpointY. • What does the SwCore include? • A big multiport memory. Here all packets, which have an outport port assigned, wait . • It is shared by all the ports. • The real bottleneck is in the RxBuffer of the endpoints. • At the RxBuffer, the packets which wait for an output port allocation wait.

  6. Pause Frame • Tx Pause Frame • Coming out from the wr0 port of the Level 1 switch. We use as DstAddr the “unique physical address associated” with the DOM. According to the standard.

  7. Pause Frame • How have we tested the Tx Pause frame? • The jumbo frames do not trigger the Tx PF. Nevertheless, they are transmitted correctly. • The high load between two ports does not trigger the Tx PF (900Mbps). • Reducing the size of Rx Buffer just for test triggers the Tx PF. • The Tx PF follows this path: • Level 1->Level 2->Broadcast->DOM Next tests: increase the number of chatty ports in a switch.

  8. Pause Frame • Rx Pause Frame (broadcast switch): • We have interchanged some mails with Peter about this issue. • Conclusions: • The reception of a pause frame from the DOM side will halt the whole broadcast link for a quanta. • There must be a list of faulty DOMs at the broadcast switch. If a DOM requests too many PFs its petitions should be ignored.

  9. Pause Frame • Rx Pause frame: • So far we manage to reach the standard PF. Customization and tests for KM3Net switches are in process. • e.g. ping halt between one PC (.10) and one SPEC (.20). Little cheat in the quanta (65535 ~ 4,23 sec).

  10. General Questions. • The size of the endpoint Rx buffers has been increased until 27KB (3 Jumbo frames). • The PF quanta is up to 65535 (~ 33.545 ms). • Custom values are configured through WB registers: • TX occupation trigger. • Tx quanta. • Time to refresh the faulty DOM Table. (Rx)

  11. Customization of WR Switch • KM3Net topology requires: • Gateware/Firmware modifications: • Broadcast implementation (TX to DOMs)  Done and waiting for feedback from the KM3net community. • Pause frame protocol  Tx done and RX in progress. • KM3Net demonstrator 3 network levels: • 2 SPECs as DOMs • 3 WR switches as ShoreStation network Done and available in KM3Net repository

  12. QUESTIONS ? info@sevensols.com (+34) 958 285 024 (+34) 690 962 646 www.sevensols.com C/Baza, parcela 19 Nave 3 \ P.I. Juncaril \ 18210 – PELIGROS – GRANADA - SPAIN

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