Time & date 

This meeting:  Tuesday, January 15,  10 pm Pacific time (Nb now on winter time); a day later 11:00 am Pakistan time; 11:30 am India time; 2:00 pm Malaysian & Guangzhou time;  1:00 pm Thailand time; 8:00 am Jordan time.  We moved the time forward by 2 hours to accommodate the time in Jordan.

Format

New items and updates are in boldface.

Coordinates of team members:

See: http://pinger.unimas.my/pinger/contact.php

• Need to add Umar and Dr. Taha - Johari

Attendees

Invitees:

Wajahat Hussain, Taha (SEECS), Saqib (GZHU); Johari (UNIMAS);  Adib (Turkey); Dr. Charnsak Srisawatsakul? (Ubru), Eyad Ayoubi (Jordan), Baraa Muslmani( Jordan), Dr. Shadi Jawarneh (Jordan)

• + Responded via Doodle will attend; - Responded via Doodle but unable to attend on this date; ?email sent asking if attending

Actual Attendees

Saqib, Bebo, Les.

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&copyownerid=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 will send an email reminder to pinger-my.
• This meeting was scheduled with the aid of a Doodle poll. 
  • It was by Zoom

Use of Zoom

Currently, there will be a different URL for each meeting of the form https://stanford.zoom.us/j/198241953 where the 195360538 will vary from meeting to meeting. 

Action Items from previous meetings

• Set up email list pinger-am in https://groups.google.com for the Amity PingER team including Aayush Jain, James David, Naman Madan, Dr Sai Sabitha. Sent invites 1/26/2018.

Jordan  

We had a Zoom meeting with Eyad and Baraa of the Jordan team.

• They will install the PingER traceroute server, the data gatherer (ping_data.pl) and the Measurement Agent (MA, pinger2.pl). 
  • Email sent requesting update 1/12/2019.  No response.
• Les updated the web page on requirements.
• The team planned to attend this January 2019 meeting, however, Baraa and Eyud have exams, and no word from Dr. Shadi

Amity (Updated 1/3/2019).

Email list (pinger-am in https://groups.google.com) set up for the Amity PingER team including: Aayush Jain, James David, Naman Madan, Dr Sai Sabitha. Invites sent 1/26/2019

Dr. Sai Sabitha Topher sent the final copy of paper Id 255: "Network Performance of PingER data with respect to growth of the Telecom Industry in India" that was presented at Amity Confluence conference 1/10/2019.

Requested final copy of the paper ID 256: "Extension of the PingER project onto Mobile Devices using Android Applications" for the SLAC archives, by email 1/26/2019.

From the meeting with Amity last month:

We (Topher and the PingER team) agreed to request Amity to share the App and instructions with us; we will look at installing on a jailbroken Android phone at the San Francisco end and try it out.

• Instructions from Aayush to load the application are at ePingER Functional prototype (for Androids only)
  • Did Topher get a chance to look at this or does he need more?

We also need to finish up the proxy acquisition of data from the Android MAs. 

• We will use anonymous FTP to gather the data.
• They will add the GPS coordinates (lat/long) to the MA data. This will enable looking at mobile PingER measurements.

Adib (Updated 12/15/2018)

• Adib moved to Karabuk University in Turkey where he is an Associate Professor.  
• He will discuss with the department head about installing a PingER MA there.
• Regarding the paper, he will search again for a good journal to submit it to.

• Saqib's current contract expires February 2019. Saqib reports that things are still unsure, his current contract cannot be renewed. He will return to Pakistan February 15th 2019. He has applied to multiple places in China, Pakistan, etc.

Thailand (No update 8/9/2018, No update 9/6/2018, No update 11/19/2018, 1/15/2019)

Charnsak is looking at a host in Champasak University, Chan Parsa province in Laos as a potential site for a PingER MA. Charnsak just got approved to make contact with the Champasak University. He expects to set up the MA in the next 4-5 months (say towards end 2018). It also depends on the partner university, and there may be a lot of paperwork.

Email requesting update sent 12/6/2018.

UNIMAS (No update 8/9/2018, no update 9/6/2018, no update 10/7/2018, no update 11/19/2018, 12/11/2018, 1/15/2019)

Need to add Umar Kalim to http://pinger.unimas.my/pinger/contact.php. From the 7/5/2018 meeting: Johari can't ssh into the server so he will go to it on Monday.  He will also upload the new UNIMAS PingER website next week.

Sent reminder emails 8/6/2018. 9/3/2018.

PingER at SLAC  

PingER IPV6 support

• Les disabled the GZHU Beijing MA.
• There was a discussion on GDPR and possible implications for PingER. The PingER-my email list is a Google email list, we believe people can remove themselves. There may be some other implications however, we are not aware of them.

Context:

• Is there any statistical difference between ICMP and TCP Ping? The context here is the Internet (not data center). This is important because the network stack is different (e.g., MPI over infiniband) and latencies are significantly less.

Questions:

• 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:
    https://drive.google.com/open?id=1ZPgljFCDFcsVUxEFA6NYMjhayoqYtMYi
• 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.
• 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?Is there a difference between IPv4 measurements vs. IPv6.
  • It may be that end hosts which are farther away have larger variances and thus the pronounced differences.

Next Meeting

Next meeting:  There will be a Doodle poll, February week 11-14th 10 pm Pacific time ; a day later 11:00 am Pakistan time; 11:30 am India time; 2:00 pm Malaysian & Guangzhou time;  1:00 pm Thailand time; 8:00 am Jordan time.  We moved the time forward by 2 hours to accommodate the time in Jordan.

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