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I assume the min RTT 4.777ms is closer to the actual RTT. The RTT measurements from catchunks include the timeouts and retransmissions, so you can see the average and max are much larger. <br class="">
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<span style="color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; display: inline !important; float: none;" class="">Lan</span>
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<div class="">On Dec 30, 2019, at 11:25 PM, Athreya Nagaraj <<a href="mailto:indiathreya92@gmail.com" class="">indiathreya92@gmail.com</a>> wrote:</div>
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<div dir="ltr" class="">Hi Lan
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<div class="">Thank you for your response.</div>
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<div class="">Please find below the output of ndncatchunks during one of the experiments-</div>
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<div class="">All segments have been received.<br class="">
Time elapsed: 55.1154 seconds<br class="">
Segments received: 23832<br class="">
Transferred size: 104858 kB<br class="">
Goodput: 15.220085 Mbit/s<br class="">
Congestion marks: 69 (caused 5 window decreases)<br class="">
Timeouts: 414 (caused 5 window decreases)<br class="">
Retransmitted segments: 347 (1.43513%), skipped: 67<br class="">
RTT min/avg/max = 4.777/144.127/27253.940 ms<br class="">
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<div dir="ltr" class="gmail_attr">On Mon, Dec 30, 2019 at 11:50 PM Lan Wang (lanwang) <<a href="mailto:lanwang@memphis.edu" class="">lanwang@memphis.edu</a>> wrote:<br class="">
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<div style="overflow-wrap: break-word;" class="">How did you measure the RTT during the catchunks transfer? Maybe you can send the catchunks output (or at least part of it)?<br class="">
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<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; float: none; display: inline;" class="">Lan</span>
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<div class="">On Dec 29, 2019, at 9:58 PM, Athreya Nagaraj via Ndn-interest <<a href="mailto:ndn-interest@lists.cs.ucla.edu" target="_blank" class="">ndn-interest@lists.cs.ucla.edu</a>> wrote:</div>
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<div dir="ltr" class="">Hi all
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<div class="">I have used the term 'bus topology', which is wrong. The topology I have used is 4 raspberry pi devices connected via 3 point-to-point links in a linear fashion. I've attached a representative topology diagram. I apologize for my mistake.</div>
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<div class="">Thanks and Regards</div>
<div class="">Athreya H N</div>
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<div dir="ltr" class="gmail_attr">On Sun, Dec 29, 2019 at 10:39 PM Athreya Nagaraj <<a href="mailto:indiathreya92@gmail.com" target="_blank" class="">indiathreya92@gmail.com</a>> wrote:<br class="">
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<div dir="ltr" class="">Hi all
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<div class="">I'm a student working on a testbed of NDN. The testbed consists of four raspberry pi connected in a bus topology. The two end devices act as producers and consumers for NDN data. The middle two devices act as routers. I use ndncatchunks to send
a 100 MB file through the testbed. I observe that the RTT for this is significantly more (around 10 times more) than that for an FTP application on the same testbed. The throughput is also lesser compared to FTP (around 20% lesser for NDN). I was wondering
what could cause this difference. </div>
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<div class="">Also, another observation I made was that when I was testing the testbed setup with ndnping, the RTT was not so high.</div>
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<div class="">I have also previously worked on similar topology with NDN and the machines used were desktop machines. In this case, NDN was better than FTP.</div>
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<div class="">Any thoughts on what could be causing this? </div>
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<div class="">Thanks and Regards</div>
<div class="">Athreya H N</div>
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