Developer's meeting

Wednesday 7 Mar 2018, 17:00 → 18:00 Europe/Zurich

present: Enrico, Roland, Giovanna, Eric, Milo, Frank

Throughput tests:

• "power budget exceeded" issues have returned
  • issue thought to be not with the card but with the PCIe power consumption
  • likely related to f/w update of the FELIX host. Roland will try to play with this once more
• severe performance penalty when moving netio::messages in memory
  • it may be possible to send many frames in a single netio::message, this would greatly reduce message fragmentation
• another issue is that the felixcore throughput is not high enough
  • Roland is discussing details with Joern
  • among other items, ProtoDUNE specific modifications are conceivable; however, branching off the main FELIX development would mean losing "automatic" support

Planning:

• Roland is planning to have another meeting with Joern soon, to see what can be further optimised on the TCP/IP side (leave Infiniband as a backup option for now)
• next week: also complete the BoardReaders -- more thorough data quality tests can then start

Next meeting: tentatively planned for March 21, unless Roland et al. indicate that it will be useful to have a meeting already next week

17:00 → 17:20 EHN1 progress

Speakers: Enrico Gamberini (CERN), Roland Sipos (Institut of theoretical physics Eotvos Lorand University (HU))

NETIO throughput measurements.pdf