Introduction
...
As reported in the Sep-Oct 2010 HEC report, path from SEECS to UET Taxila is seeing high round trip times.
...
Analysis
...
Looking at the pingtable.pl data from SEECS to UETTaxila results for September and October one sees:
...
We decided to look at the data in more detail using http://pinger.fnal.gov/cgi-bin/graph_pings.pl?src_regexp=monitor.niit.edu.pk&dest_regexp=pinger.uettaxila.edu.pk and with the file format of csv. the The format of the CSV output is:
...
This was imported into Excel, the Unix time converted to Excel time day using Excel=Unix/(60*60*24)+"1/1/1970"
and then plot we plotedt time of day versus average RTT, ipdv, max RTT. We also looked for correlations with day of the week. The results show little correlation with time of day or day of week.
...
| Code Block |
|---|
/nfs/slac/g/net/pinger/pingerdata/hep/data/monitor.niit.edu.pk/ping-2010-12-26.txt.gz |
...
Change in minimum RTT
...
On the other hand looking at the smokeping plot above there is an obvious reduction in minimum RTT on or about November 10th. Prior to that date it is about 60ms, after that date it drops to about 35ms.