Time & date
Next This meeting: Monday, November 19th 8 pm Pacific time (Nb now on winter time); Tuesday, November 20th, 2018 9:00 am Pakistan time; 9:30 am India time; 12:00 noon Malaysian & Guangzhou time; and 11 am Thailand time; 56:00am Jordan time (I think)
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Wajahat Hussain-, Taha (SEECS), Saqib+ (GZHU); Johari+ (UNIMAS); Adib (UUM); Dr. Charnsak Srisawatsakul (Ubru), Les+, Bebo+, UmaUmar+
- + Confirmed attendance; - Responded but Unable to attend; ? Individual emails sent
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Saqib (but we were unable to hear him), Dr Shadi Aljawarneh, Umar, Les, Bebo, Taha Bebo
Others
Administration
- Membership of pinger-my is in https://groups.google.com.
- Bebo pointed out that the International Web Conference will be in San Francisco in 2019 (see http://www.wikicfp.com/cfp/servlet/event.showcfp?eventid=77195©ownerid=85335). There are a whole range of topics. He would love to see something submitted related to PingER.
- Maybe something on Android PingER and potential uses.
- Bebo, possible interest in an MA in Jordan - 10/9/2018.
- It is a university of Science and Technology.
- Bebo is looking to send the Home page: http://www-iepm.slac.stanford.edu/pinger/, plus Remote Host site invitation letter template, Monitor Host site invitation letter template:(txt, doc), form to register a host to the contact.
- They will attend this meeting. Dr. Shadi Aljawarneh <shadi.jawarneh@yahoo.com> skype ID shadi Jawarneh
- I have invited Shadi to joinn the pinger-my email list.
- Next meeting to be determined by Doodle poll.
- It will be via Zoom, Umar is arranging. Attendees will need the Zoom APP available at: https://zoom.us/download#client_4meeting
Jordan
- We discussed the many uses of PingER data including:
- the impact on network performance of events such as earthquakes, tsunamis, civil uprisings, the world cup,
- exploring the data semantically e.g. byLinked Open Data
- Correlations with other indices such as economics, human development.
- We also discussed:
- development of new low cost, low power PingER Measurement Agents (MA) utilizing Android devices.
- the possibilities of developing/utilizing a decentralized logging/analysis/presentation structure using BlockChain. This would reduce the dependence on SLAC.
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After the meeting, Umar and Saqib experimented with using Zoom instead of Skype. Saqib commented that the call quality was significantly better than that of Skype. Umar could hear him clearly. Therefore, Umar suggestssuggests that we should schedule a Zoom call for our next meeting. He will make the arrangements of scheduling and hosting the call.
- The platform requires the installation of client software, which is similar to Skype. As with other conference call software, it allows us to share video and screencasts. (Umar promises that Zoom doesn't pay him to market their software software
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PingER at SLAC (Updated 11/19/2018)
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- Why should we focus on minimum RTT instead of average RTT
- Min RTT essentially reflects fixed delay, while average RTT subsumes variations and path load
- Link to raw results with minRTT results:
- Are the R plots generated using minRTT?
- Averages and computed. Min RTT is available. Scripts need to be updated to use minRTT.
- What is the breakdown of latency between endpoints?If there is a difference, is it because of the type or location of the source? What if the source of traffic was not SLAC?Is there a correlation with the distance between the endpoints?
- Latency for an echo packet to travel up the stack and back down is about 3.75 micro seconds (see StackMap https://www.usenix.org/conference/atc16/technical-sessions/presentation/yasukata). As expected, this is negligible when considered with milli second latencies.The remaining components would be propagation and queuing delay. As we can not breakdown the two in a public network without using an active look like
- To replicate use system tap. See: https://unix.stackexchange.com/questions/419449/how-can-i-determine-if-a-latency-is-due-to-a-driver-or-the-scheduler
- pathchirp etc, we'll continue to consider these as a single component.
- Latency for an echo packet to travel up the stack and back down is about 3.75 micro seconds (see StackMap https://www.usenix.org/conference/atc16/technical-sessions/presentation/yasukata). As expected, this is negligible when considered with milli second latencies.The remaining components would be propagation and queuing delay. As we can not breakdown the two in a public network without using an active look like
- Are the differences limited to a particular region? How do we determine/understand if traffic prioritization is implemented?Test in a controlled environment to avoid variables such as traffic prioritization, queuing delay due to cross traffic.Review the time series of latencies for both ICMP and TCP ping, instead of averages?
- It may be that end hosts which are farther away have larger variances and thus the pronounced differences.
- Is there a difference between IPv4 measurements vs. IPv6.
Next Meeting
Next meeting: Tuesday, November 6th 8 There is a Doodle poll sent 12/13/2018. December week of 10-13: 10 pm Pacific time (Nb now on winter time); Wednesday, November 7th, 2018 9a day later 11:00 am Pakistan time; 911:30 am India time; 122:00 noon pm Malaysian & Guangzhou time; and 11 am Thailand time.1:00pm Thailand time; 8:00am Jordan time
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Old information
GZHU moved 11/28/2018
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