EJFAT Group Meeting Apr. 7, 2022

The meeting time is 11:00am.

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

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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
  • Control Plane Gratuitous Arp cache updating (Scapy)
  • Benchmarking
  • Successfully Testing Calendar Epoch Advances
  • RT2022 - April 08 submission - August Conference
• Pending:
  • Compute Equip.- ETA 1 June
  • Networking Equip. - ETA 1 July
  • 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)
  • Data_id <-> reassembly port mapping for powers-of-two ports per host
• 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.
    • C-based control plane
      • Feedback from Compute hosts design
      • Control Plane daemon for compute host
  • Downstream:
    • DPDK
    • P4 enhancements for ipv4/6 ping, arp
    • IPV6 testing
    • EJFAT Subnet
    • HOSS Hall-D EJFAT use case
      • parallelize writing of raw data files
      • distribute raw data across multiple compute nodes for calibration skims
• AOT

Minutes:

• EJFAT subnet: VLAN 937 172.19.22.0/24
• DAQ Farm machines dafarm61 dafarm62 dafarm63 dafarm64 currently on 129.57.29.0/24 subnet w/ additional i/f available for EJFAT subnet
  • Running CentOS 7.7
  • 10Gbs NIC, but need cables (copper twinX will do)
• New P4 to include
  • ARP, ping, iCMP ipv4/6
  • ipv6 neighbor discovery TBD
• ERSAP feed end bottleneck needs investigation; Timmer's blaster may provide relief
• Peter Nugent/LBNL: LDRD LBNL+JLAB combines JLAB streaming + LBNL compute

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