[Ndn-interest] Regarding RTT for ndncatchunks in raspberry pi

[Athreya Nagaraj]

No. I've not increased the interest lifetime. Is there any other possible
cause of such a high max rtt value?

On Thu, 2 Jan 2020 at 10:07 PM, Davide Pesavento <davidepesa at gmail.com>
wrote:

> Actually, ndncatchunks does not take RTT measurements for
> retransmitted segments. So a max RTT of more than 27 seconds looks
> very suspicious to me, unless you also increased the Interest
> lifetime.
>
> Davide
>
> On Thu, Jan 2, 2020 at 11:09 AM Lan Wang (lanwang) <lanwang at memphis.edu>
> wrote:
> >
> > 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.
> >
> > Lan
> >
> > On Dec 30, 2019, at 11:25 PM, Athreya Nagaraj <indiathreya92 at gmail.com>
> wrote:
> >
> > Hi Lan
> >
> > Thank you for your response.
> >
> > Please find below the output of ndncatchunks during one of the
> experiments-
> >
> > All segments have been received.
> > Time elapsed: 55.1154 seconds
> > Segments received: 23832
> > Transferred size: 104858 kB
> > Goodput: 15.220085 Mbit/s
> > Congestion marks: 69 (caused 5 window decreases)
> > Timeouts: 414 (caused 5 window decreases)
> > Retransmitted segments: 347 (1.43513%), skipped: 67
> > RTT min/avg/max = 4.777/144.127/27253.940 ms
> >
> > On Mon, Dec 30, 2019 at 11:50 PM Lan Wang (lanwang) <lanwang at memphis.edu>
> wrote:
> >>
> >> How did you measure the RTT during the catchunks transfer?  Maybe you
> can send the catchunks output (or at least part of it)?
> >>
> >> Lan
> >>
> >> On Dec 29, 2019, at 9:58 PM, Athreya Nagaraj via Ndn-interest <
> ndn-interest at lists.cs.ucla.edu> wrote:
> >>
> >> Hi all
> >>
> >> 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.
> >>
> >> Thanks and Regards
> >> Athreya H N
> >>
> >> On Sun, Dec 29, 2019 at 10:39 PM Athreya Nagaraj <
> indiathreya92 at gmail.com> wrote:
> >>>
> >>> Hi all
> >>>
> >>> 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.
> >>>
> >>> Also, another observation I made was that when I was testing the
> testbed setup with ndnping, the RTT was not so high.
> >>>
> >>> 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.
> >>>
> >>> Any thoughts on what could be causing this?
> >>>
> >>> Thanks and Regards
> >>> Athreya H N
> >>
> >> <Untitled Diagram.png>_______________________________________________
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> >>
> >>
> >
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-- 
Regards,
Athreya H N
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