EJFAT Group Meeting Jan. 20, 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:

  1. Previous meeting
  2. Issues for Discussion:
    • Status of P4 code update for packet checksum (ESnet)
    • Status of new bit-file for UDP-LB U280 FPGA (ESnet)
    • Status of S/W support stack for LB Host Control Plane (ESnet)
    • Differences in OS Networking behaviors
    • UDP AutoFragmentation
    • Status of Edge to Core Test Design
      • ERSAP / CLARA Data Generation for UDP-LB (Vardan)
      • UDP-LB Meta Data Insertion / Packetizer (Carl)
      • UDP-LB Emulator (Mike)
      • UDP-Reassembly (Carl)
      • Test Plans / Goals (Mike)
    • Configuration of network switches and Host CPU for FPGA LB (Bryan)
    • Status of PO for Edge to Core Test Equipment (Amitoj)
    • Status of PO for Network Equipment (Brent)
  3. AOT


Minutes:

  • New U280 bitfile built and currently in test
  • Control Plane helper API still in development
  • Must engineer complete data path from source/sink for full path MTU
    • Safe choice < 1500 B
    • Should engineer network for 9kB
    • Layer-2 switches do not induce fragmentation
    • IP headers can be designated as Do not fragment (We may want to impose this on Data Sources)
    • ICMP msg feedback can indicate that device would have fragmented (but can't)
    • tracepath tool can report path MTU
    • LB host should send gratuitous arp msgs
    • VLAN for 2 x 100Gbs switch ports for U280
  • Compute Server PO: awaiting pricing for bundles/unbundled configurations
  • Network PO - submitted
  • Action - Amitoj - enhance EJFAT wiki page with engineering details for
    • setting up 9kB MTU
    • settings for Linux kernel
  • Action - Bryan - engineering details for initialization of switches, hosts, FPGA for coordinated network address discovery, etc.

Attendees:

  • M. S. Goodrich
  • D. Lawrence
  • G. Heyes
  • Y. Kumar(ESnet)
  • S. Sheldon (ESnet)
  • C. Timmer
  • V. Gyurjyan
  • D. Abbott
  • B. Hess
  • A. Singh
  • B. Morris
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