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Fiber Asset Management Software -- Carla Hunt, MCNC
To hear an MP3 file recording of Carla's talk, go to http://noc.ucsc.edu/docs/Fiber-mgmt/ and click on the link that says Carla_Hunt.mp3
- Eric Boyd asked if the motivation for deploying the fiber database was to meet BTOP requirements.
- Carla said that it was partially motivated to support the BTOP grant, but the bigger interest was to be able to track the fiber, and for planning purposes.
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ESnet Distributed Help Desk -- Brian Tierney or Phil DeMar, ESnet
- Eric Boyd asked if the 'hub' definition for FermiLab consisted of ESnet's FermiLab box, as well as FermiLab's boxes.
- Phil said that the concept was to have a user-centric view. T
- hey don't care who runs the perfSONAR box, just that they can obtain measurements applicable to FermiLab.
- Eric asked if this could be extended to a three-level system (e.g. a hub including regional networks and all universities).
- Phil thought that they would go from at the university level. The basic idea was just to keep users from having to select hostnames.
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Periscope Presentation -- Martin Swany, University of Delaware
No questionsslides
IPv6, backbone measurements, and Netflow -- Matt Zekauskas, Internet2
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Issues around Buffer Bloat - Jim Warner, UC Santa Cruz
- Jim Warner noted that Jim Getty has been promoting the "buffer bloat" issue.
- Jim Warner felt that the mailing lists and websites like fasterdata.es.net were telling people that bigger buffers aren't a problem.
- Carla Hunt asked what the recommendation that the mailing lists and websites are suggesting?
- Jim said that fasterdata.es.net recommended an outbound queue length of 1000 packets for 1G, and 10000 packets for 10G.
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- He felt that was far too much buffer at home.
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- Most of the buffers filling up are in the DSL boxes which are unchangeable.
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- He noted that the outbound traffic can be shaped so that DSL queueing doesn't happen.
- Martin Swany felt that this was a TCP problem.
- He felt it was misguided to screw with sending so that TCP doesn't get confused.
- Jon said that TCP worked that way, and because of that, we can't ignore it.
- Jon thought the problem with buffering was that it was dependent on the link speed the router was attached to.
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- One megabyte of buffering was nothing for 1G ethernet, but on DSL, it's forever.
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- Jim noted that the effect of all this "hidden buffering" was a large percentage of a second (1/3 and higher).
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- Prasad noted that it can be even worse on a noisy channels like wireless where retransmits happen after 60ms so you can get even higher blocking times.
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- Jim said that wireless was a problem for lots of reasons, including that valid wireless speeds varied from 2Mbps to 100Mbps.
AGENDA AND ABSTRACTS
Fiber Asset Management Software -- Carla Hunt, MCNC
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