Observations on poor transfer performance - especially with writes to Echo - have been reported.

This is a brief summary of various performance studies.

Iperf3 testing

Tested with two versions of perf.

Overall the Multi-threaded (mt) gave better throughputs, particularly with the ingress to RAL rates.

PREF=/home/tier1/jwalder/iperf-3.15-mt-beta1; LD_PRELOAD=${PREF}/lib/libiperf.so.0.0.0 ${PREF}/bin/iperf3 -c ds1-london.perf.ja.net -p 5202 -P16  --get-server-output  -4

PREF=/home/tier1/jwalder/iperf/iperf3_15; LD_PRELOAD=${PREF}/libiperf.so.0.0.0 ${PREF}/iperf3 -c ds1-london.perf.ja.net -p 5202 -P16  --get-server-output  -4

Testing and results

Single-shot tests for each result; no significant difference observed between IPv4 and IPv6
Only the results from the MT tests are shown. Testing from JISC to RAL uses the --reverse flag. i.e. the JISC end is always acting as the server