Jisc Network Performance Monitoring on the Janet Network
Discover how Jisc supports end-to-end network monitoring on the Janet network, providing network performance test facilities, visualizations, and examples of performance testing scenarios. Learn how to join the Jisc Mesh to measure network performance and address issues like asymmetric routing and TCP tuning.
Download Presentation
Please find below an Image/Link to download the presentation.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author. If you encounter any issues during the download, it is possible that the publisher has removed the file from their server.
You are allowed to download the files provided on this website for personal or commercial use, subject to the condition that they are used lawfully. All files are the property of their respective owners.
The content on the website is provided AS IS for your information and personal use only. It may not be sold, licensed, or shared on other websites without obtaining consent from the author.
E N D
Presentation Transcript
How Jisc is supporting End to end network monitoring with on the Janet network Chris Walker (Jisc) Duncan Rand, Raul Lopes, Tim Chown (Jisc) IRIS Collaboration meeting 3rdDecember 2024
Jiscs network performance test facilities Open to our members, and their collaborators, to use perfSONAR 10G (Slough) and 100G (London) Mesh and archive Iperf and ethr 10G - (100G on request) 10G data transfer node (DTN) for application-oriented disk-to-disk tests (100G coming) All facilities IPv4/IPv6 Jumbo frames (MTU=9000) TCP-BBRv3 See https://www.jisc.ac.uk/guides/using-the-janet-network-performance-test-facilities Email netperf@jisc.ac.uk for any assistance or advice 2
perfSONAR network monitoring Matrix of tests Jisc (https://ps-mesh.perf.ja.net/grafana/) Mesh configuration Visualisation / archive of results Bandwidth (automated iperf ~6hrs) One way Latency Packet loss Traceroute 3 perfSONAR Workshop 2024
Performance Example 1 ps-london (100G) to a RAL Jasmin/SKA node See here. Excellent single stream performance (Top) RAL -> London steady London -> RAL less stable Performance testing (Bottom) Drop due to testing Net.core.optmem_max= 1M 4
Performance Examples 2 Sheffield To: 9Gb/s From: 0.1Gb/s Issue: Asymm routing Liverpool ~1-2Gb/s Issue: Asymm routing 5
Performance Examples 3 Glasgow To: good From bad Routing Durham ~10Gb/s Improvement to with detuning of 100Gbit transmission 6
Performance 4 Lancaster 100G link causes performance decrease (below L) but why? 100G Jisc node detuned (Top R) increase 3->15 Gb/s (Top R) 10G Jisc node ~10Gb/s (Mid R) 100G QMUL ~3Gb/s (Bottom R) 7
Joining the Jisc Mesh How? e-mail netperf@jisc.ac.uk and ask psconfig remote add https://ds2- london.perf.ja.net/psconfig/ds2- psconfig.json Why? Measure network performance end to end. Facilitates debugging Found and fixed various issues Jisc has helped to correct Asymmetric routing TCP tuning IPv6 config, DNS config 8
Christopher J. Walker Christopher.Walker@jisc.ac.uk netperf@jisc.ac.uk customerservices@jisc.ac.uk customerservices@jisc.ac.uk jisc.ac.uk jisc.ac.uk
