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This is a project suggested by Bebo White to build a PingER monitoring host based on an inexpensive piece of hardware called Raspberry Pi (see more about Raspberry Pi) using a linux distribution as OS (see more about Raspbian). If successful one could consider using these in production reducing the costs, power drain (they draw about 2W of 5V DC power compared to typically over 100W for a deskside computer or 20W for a laptop) and space (credit card size) assisting monitoring sites to be able to procure and support such monitoring hosts. This is the same type of power required for a smartphone so off the shelf products including a battery and solar cells are becoming readily available. This the Raspberry could be very valuable for sites in developing countries where cost, power utilization and to a lesser extent space may be crucial.

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The table below shows the various aggregate metrics measured from monitor MA to target comparing pinger.slac.stanford with pinger-raspberry.slac.stanford.edu. The columns are arranged in pairs. The first of each pair is for pingerr.slac.stanford.edu, the second for pinger-raspberry.slac.stanford.edu. Each pair is measured over the same time period. Different pairs are measured over different time periods.

Metric \ Monitor Targetpinger to pinger-raspberrypinger-raspberry to pingerpinger to sitkapinger-raspberry to sitkasitka to pingersitka to pinger-raspberrypinger to CERNpinger-raspberry to CERN
Time period  June 17 - July 13, 2015June 17 - July 13, 2015June 17 - July 14, 2015June 17 - July 14 July 15 - July 16 2015July 15 - July 16 2015   June 17 - July 12, 2015June 17 - July 12, 2015
Samples10890108501090010850Samples   820820 10900 10900 

Min RTT

0.43 ms0.41 ms22 ms22.3 ms22 ms22.4 ms150 ms151 ms
Avg RTT0.542 ms0.529 ms23.9 ms23.827 ms22.303 ms22.709 ms150.307 ms151.024 ms

Max RTT

1.15 ms20.8 ms761 ms334 ms26.3 ms25.9 ms288 ms183 ms
Stdev0.055 ms0.540 ms9.58 ms9.60 ms0.219 ms0.222 ms9.572 ms9.594 ms
Median RTT0.542 ms0.51 ms22.3 ms22.7 ms22.3 ms22.7 ms150 ms151 ms
25%

0.514 ms

0.48 ms22.2 ms22.69 ms22.3 ms22.8 ms149.99 ms150.99 ms
75%0.564 ms0.532 ms22.4 ms22.8 ms22.19 ms22.59 ms151 ms151 ms
IQR0.05 ms0.052 ms0.2 ms0.11 ms0.113 ms0.210 ms1.01 ms0.01 ms
Min IPD-0.59 ms-20.29 ms-244 ms-235.1 ms

-0.4 ms

-0.39 ms-137 ms

-32 ms

Avg IPD0 ms0 ms0 ms0 ms0 ms0 ms0 ms0
Max IPD0.62 ms20.26 ms268 ms146 ms3.6 ms3.29 ms138 ms32 ms
Median IPD0 ms0 ms0 ms0 ms0 ms0 ms0 ms0 ms
Stdev    0.248 ms0.296 ms  
25% IPD-0.04 ms-0.03 ms-0.1 ms-0.11 ms-0.1 ms-0.1 ms-0.01 ms-0.01 ms
75% IPD0.03 ms0.02 ms0.09 ms0.1 ms0.01 ms0.09 ms0 ms0 ms
IQR IPD0.07 ms0.05 ms0.190 ms0.210 ms0.2 ms0.190ms0.01 ms0.01 ms
Min(abs(IPD))0 ms0 ms0 ms0 ms0 ms0 ms0 ms0 ms
Avg(abs(IPD))0.041 ms0.066 ms0.424 ms0.406 ms0.120 ms0.139 ms0.386 ms0.046 ms
Max(abs(IPD))0.0628ms20.294 ms268 ms235.1 ms4 ms3.29 ms138 ms32 ms
Stdev    0.248 ms0.262 ms  
Median(abs(IPD))0.03ms0.024 ms0.09 ms0.1 ms0.1 ms0.09 ms0 ms0 ms
25%(abs(IPD))0.01ms0.008 ms0.01 ms0.01 ms-0.01 ms-0.01 ms0.01 ms0.01 ms
75%(abs(IPD))0.058 ms0.05 ms0.1 ms0.19 ms0.1 ms0.19 ms1 ms0 ms
IQR(abs(IPD)0.048 ms0.042 ms0.09 ms0.11 ms0.11 ms0.2 ms0.009 ms0.01 ms
Loss0% 0%0%0.008%0.000%0%0%0.000%0%0%

Kolmogorov-Smirnov Test

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