[ndnSIM] Unexpected increase in RTT

Alex Afanasyev alexander.afanasyev at ucla.edu
Wed Apr 30 21:26:39 PDT 2014

Hi Azar,

Which delays are you looking at?  FullDelay or LastDelay.   The first one includes all overhead of consumer retransmissions.

Btw, how large is your RTT?  Usually for 1Mbps (with realistic delays) there is really no much value of having maxPackets more than a couple.


On Apr 25, 2014, at 4:56 PM, Azar Fazel <azarmehr65 at gmail.com> wrote:

> Hi Alex
> I'm running this simple scenario: there are 3 nodes, one consumer, one producer and one router ( same as simple scenario in the Example page) 
>  they are connected together using p2p links with the bandwidth of 1Mbps and the maxPacket of 10000. The consumer is sending interests to the producer with the frequency of "1" ( 1 interest a second).
> I have a database of prefixes which consists of 1000 prefixes. In a loop ( 1000 times) each time the consumer randomly selects one of these prefixes and requests it.
> I have populated the RTT for each Interest by using "AppDelayTracer" and run the simulation for 200 seconds.
> But the delays that AppDelayTracer  shows are increasing along with the time of simulation ( they starts with 0.017 us and at the end it is about 50 us). I tired to change the value of "maxPacket", but the issue still exists.
> Can you please give me some hint how can I interpret this growth of RTTs?
> Thanks
> Azar
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