Date: Fri, 29 Mar 2024 15:33:57 +0000 (UTC)
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1=
2-July-2011
Welcome -- _Carla Hunt
Internet2 Update -- Aaron Brown and Jeff Boot=
e
- Aaron Brown noted that Internet2 had recently released a minor release =
of the perfSONAR-PS Toolkit, version 3.2.0.1
- This version allows folks to download the RPMs from R+E mirrors.
- Aaron asked folks to email him if they were interested in hosting one o=
f these mirrors.
- Aaron noted that they were working on an upcoming perfSONAR-PS Toolkit =
release, version 3.2.1,
- This version should include bugfixes and some updated packages.
- The release candidate should be out in the next week or so.
- Aaron commented that Internet2 had been working with the ESnet develope=
rs on the OSCARS version 6 release, and that it should be available in the =
next few weeks.
- On the DYNES front, he noted that Internet2 has been working with the D=
YNES group 'A' participants, and that they were looking to do the first set=
of DYNES installations within the next few weeks.
- Aaron commented that Internet2 had been working on a circuit monitoring=
infrastructure as part of the DYNES work, and that he'd given a talk on it=
earlier.
- Jeff commented that Internet2 was likely going to be working on an NDT =
project with Google,
- Internet2 might be working with Verizon on a continuation of the work t=
hey'd done earlier in developing a measurement infrastructure for Verizon.<=
/li>
Fiber Asset Management Software -- Carla Hun=
t, MCNC
Slides
To hear an MP3 file recording of Carla's talk, go to http://noc.ucsc.edu/d=
ocs/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, b=
ut the bigger interest was to be able to track the fiber, and for planning =
purposes.
- Jim Warner asked if this software was being used for campuses, or just =
wide area.
- Carla said that the primary use is for the wide area. The idea was to m=
ake it easy for folks whose job was in the campus could easily access the d=
ata
ESnet Distributed Help Desk -- Br=
ian Tierney or Phil DeMar, ESnet
slides
- 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 me=
asurements applicable to FermiLab.
-
- Eric asked if this could be extended to a three-level system (e.g. a hu=
b 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.
- Carla Hunt asked if the 'hub' metadata was in the lookup service, or wa=
s local to the Web UI. Phil wasn't sure, but figured it was local to the We=
b UI.
- Jim Warner asked if the cached data was kept around longer than the ori=
ginal perfSONAR services would keep it. A number of folks said that perfSON=
AR services tend to keep data forever.
Periscope Presentation -- M=
artin Swany, University of Delaware
slides
IPv6, backbone measurements=
, and Netflow -- Matt Zekauskas, Internet2
- Matt said that Internet2 has been monitoring for a long time.
- They've been using firewall filters on the Junipers that are configured=
to soley measure counts, not block anything.
- They've seen 5G of v6 traffic on the backbone.
- The hardware to do proper flow monitoring is expensive though, so they'=
ve implemented a workaround.
- They duplicate all IPv6 packets to a local PC (<1G per site), and do=
flow generation from those packets.
- This came online just before IPv6 day, and has been monitoring ev=
er since.
- They've been working on a backend to save and make avialable all these =
statistics.
- He noted that the data is available if researchers are interested in it=
, and that it is anonymized (80-bit zeroed, he thinks).
Brian Tierney asked if the backbone bwctl and owamp measurement traffic =
was using IPv6. Matt said that it was, but that the meaurements being shown=
was connector traffic, and not backbone traffic.
Issues around Buffer Bloat - Jim Warner, UC=
Santa Cruz
- Jim Warner noted that Jim Getty has been promoting the "buffer bloat" i=
ssue.
- 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 web=
sites are suggesting?
- Jim said that fasterdata.es.net recommended an outbound queue length of=
1000 packets for 1G, and 10000 packets for 10G.
- He felt that was far too much buffer at home.
- Most of the buffers filling up are in the DSL boxes which are unc=
hangeable.
- He noted that the outbound traffic can be shaped so that DSL queu=
eing 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.
- One megabyte of buffering was nothing for 1G ethernet, but on DSL=
, it's forever.
- Jim noted that the effect of all this "hidden buffering" was a la=
rge percentage of a second (1/3 and higher).
- Prasad noted that it can be even worse on a noisy channels like w=
ireless where retransmits happen after 60ms so you can get even higher bloc=
king times.
- Jim said that wireless was a problem for lots of reasons, includi=
ng that valid wireless speeds varied from 2Mbps to 100Mbps.
AGENDA AND ABSTRACTS
Fiber Asset Management Software -- Carla Hunt, MCNC
- In November 2010, MCNC, an independent 501 c3 nonprofit that operates t=
he North Carolina Research and Education Network, issued an RFP for identif=
ying an appropriate vendor to supply fiber asset management and mapping sof=
tware to be used to document and manage existing and planned Outside Plant =
(OSP), allowing MCNC to accurately document the location and status of fibe=
r assets in North Carolina that are being acquired as a result of the Broad=
band Technology and Opportunities Program (BTOP). Carla Hunt from MCNC will=
describe the process for developing the RFP and evaluating vendor offering=
s.
ESnet Distributed Help Desk -- Brian Tierney or Phil DeMar, ESnet
- The E-Center Network Weather & Performance Monitor is a project who=
se goal is to provide a single location for researchers to obtain detailed =
network path information of interest, and seek assistance with related conc=
erns. This talk will describe the project, and detail its progress so far.<=
/li>
Periscope Presentation -- Martin Swany, University of Delaware
- Periscope Presentation Abstract: Measurement is critical for understand=
ing system performance, but it is often difficult in distributed environmen=
ts. This talk describes a framework called Periscope that extends and=
integrates existing perfSONAR, XSP and NetLogger systems to provide end-to=
-end, activity-specific measurements that can potentially handle all&=
nbsp; relevant performance data for a given user's activity in a distribute=
d system.
IPv6, backbone measurements, and Netflow -- Matt Zekauskas, Internet2
- This short presentation will highlight the IPv6 measurements on the Int=
ernet2 backbone, and the recent addition of flow data.
Issues around Buffer Bloat - Jim Warner, UC Santa Cruz
- Buffering by network switches can cause excessive delay in packet deliv=
ery which can have negative consequences for latency sensitive applications=
such as VoIP. This phenomena, dubbed bufferbloat, has recently garnered wi=
despread attention in the popular press. Members of the R+E community will =
discuss the challenges in handling bufferbloat in their networks.
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