EJFAT EPSCI Meeting Apr. 27, 2022

The meeting time is 2:00pm.

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https://jlab-org.zoomgov.com/j/1612038101?pwd=Yk96QUcyT1NDVTRRUGNtOFVSSTdaUT09&from=addon

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161 203 8101

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378382

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Agenda:

• Previous meeting

• Situation:
  • Testing with End-to-end EJFAT ERSAP solution on FPGA LB
  • Jumbo Frames - indra-s2,s3, alkaid, fpga
  • Linux IP stack buffer size increased
  • Using script based LB Control Plane
  • ERSAP feed end bottleneck needs investigation; Timmer's blaster may provide relief
  • EJFAT subnet
    • VLAN 937 172.19.22.0/24
    • 10Gbs NIC, but need cables (copper twinX will do)
  • DAQ Farm machines dafarm61 dafarm62 dafarm63 dafarm64 currently on 129.57.29.0/24 subnet w/ additional i/f available for EJFAT subnet
  • Testing newly received FPGA load
    • arp, ping - working
    • Port entropy field - currently broken, update pending
    • MTU size restricted to max 1500, update pending
    • Possibly incorrect control message responses being investigated
• Pending:
  • Compute Equip.- ETA 1 June - currently on track sans 100Gbs NICs
  • Networking Equip. - ETA 1 July 5 October
  • Support C libraries for LB Host Control Plane
  • ESnet smartnic open-source GitHub repo (April)
  • ESnet private, forkable Jlab P4 and simulations GitHub repo (April)
• To Do:
  • Near Term:
    • Hall-B FT calorimeter and hodoscope streaming readout test (scheduled for week of 04/10 or 04/17)
      • 2 crates for FT calorimeter, furnished with fADC250s. Total 332 channels.
      • 1 crate for the hodoscope that has 12 fADC (total 192 channels)
      • Update firmware on all 3 VTPs to send fADC aggregated data frames in the EVIO format, through UDP.
      • Design ERSAP FE application containing an actor that receives VTP frames through UDP, extracts information about the source/data ID and frame number (tick), and sends it to the EJFAT packetizing engine.
      • Stage 1 testing: single stream/data-ID
        • EJFAT LB + reassembly (RA) engine overall performance data-rate dependence.
        • EJFAT LB + RA engine performance dependence from the EJFAT packetizing engine MTU settings
      • Stage 2 testing: multi-stream/data_ID
        • Use EJFAT LB firmware that supports load balancing of multiple source/data_IDs.
        • EJFAT LB + RA engine performance as an event builder (i.e. source ID aggregator), a capability to send all available data_ID's with the same tick (time frame) to a single destination. NB Hall-B FT calorimeter and hodoscope setup is capable of sending up to 12 data streams.
        • May be able to use Abbott's indra-s1 setup
        • May be to use new VTP f/w with Hall-B VTP's - Abbott's return
        • CODA 3.10 + ERSAP
    • Control Plane
      • Feedback from Compute hosts
      • Control Plane daemon for compute host
      • HOSS Hall-D EJFAT use case
        • parallelize writing of raw data files
        • distribute raw data across multiple compute nodes for calibration skims
        • 1 Gbs at hi-luminosity
        • Demonstrate CP based flexibility/elasticity
        • Hall-D comms with indra-s2 (DAQ 109 subnet) require network customization
        • Slides
        • Netwok Diagram
  • Downstream:
    • DPDK
    • IPV6 testing
    • RT2022 - August 01-05 Conference
• AOT

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