EJFAT Group Meeting Apr. 28, 2022

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The meeting time is 11:00am.

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Meeting URL
 https://jlab-org.zoomgov.com/j/1610125238?pwd=QnEvcjV6VFFndWZsQW15SmJKU0RJZz09&from=addon

Meeting ID
161 012 5238

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503371

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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
      • Specs
      • arp, ping - working
      • Issues:
        • 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 - Pending OK from Sergey B.
        • 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 - (Ben Raydo)
        • 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 DAQ 109 subnet require network customization; DAQ 29 subnet available
          • Slides
          • Netwok Diagram
    • Downstream:
  • AOT

Minutes:

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