Performance Working Group at TIP 2013 in Honolulu
Jan. 14, 2013
http://events.internet2.edu/2013/tip/agenda.cfm?go=session&id=10002739&event=1261
January 14, 2013
AGENDA
Welcome – Aaron Brown
Performance and Virtualization - Alessandra Scicchitano
A Performance Potpourri – Brian Tierney
Centrally Managing perfSONAR Tests for Organizations and VOs - Aaron Brown
The Effects Of GSO/TSO On TCP Performance – Andy Germain
Community Updates / Open Forum
DISCUSSION
Performance & Virtual Machines,
speaker: Alessandra Scicchitano, SWITCHPerformance & Virtual Machines
eduPERT is the (GEANT) European group for the performance people in the European NRENs.
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Update of ESNet perfSONAR Activities
speaker: Brian Tierney, ESnet
slides: https://spaces.at.internet2.edu/download/attachments/10402/20130114-tierny-perfsonarupdate.pdf
Recently upgraded ESNET ESnet backbone to 100G. ESnet runs perfSONAR everywhere. Just released beta perfSONAR-PS Toolkit 3.3-rc1, a major overhaul. More to come in next few weeks, including integration of Web10G. ESnet has 1.5 FTEs dedicated to perfSONAR support. ESNet has 80 machines deployed. They run BWCTL and OWAMP on separate hosts so that throughput tests (BWCTL) don't mess up latency tests (OWAMP) or vice-versa.
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New lookup dashboard
Centrally -managed test configsManaging perfSONAR Tests for Organizations and VOs
speaker: Aaron Brown, Internet2
slides: https://spaces.at.internet2.edu/download/attachments/10402/20130114-brown-meshconfg.pdf
Problem: each perfSONAR server is a testing island. How do we avoid doing the same test between servers, or missing a path in a mesh? Solution: a centrally-managed description of the "mesh", in JSON format. Each server downloads the the shared description periodically. This is integrated with MaDDash.
Looking for interested beta-testers.
TSO problems
The Effects Of GSO/TSO On TCP Performance
speaker: Andy Germain, NASA
The TSO feature of modern NICs will screw up tcpdump because a large packet is sent to the NIC and is then fragmented by the NIC. It makes sense to offload the CPU.
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Recommendation: turn off TSO. Andy saw these problems at 4 separate sites. Turning TSO off improved performance: packet loss went down.
Next Meeting
Next Meeting of the Performance WG will be at the Internet2 Annual Meeting. http://events.internet2.edu/2013/spring-mm/
Hope to see you there.