[ndnSIM] Question about measuring RTT for each interest

[Alex Afanasyev]

Hi Azar,

FullDelay is the time between sending the first interest for the data item ("segment") and the reception of the requested Data packet.  This time includes all possible retransmissions of Interests for this item, if any.

LastDelay is the time between last expressed interest for the data item and the reception of the requested Data.

Let's say, consumer is requesting exactly one Data item and first 2 interests were dropped for some reason:

t1: -> i1 for /data/1
..
(i1 dropped)

t2: -> i2 for /data/1
..
(i2 dropped)

t3: -> i3 for /data/1
...

t4:  <- data /data/1

FullDelay = t4 - t1
LastDelay = t3 - t4

Both delayS and delayUS is the same value, just printed in different time units.

---
Alex

On Apr 21, 2014, at 5:38 PM, Azar Fazel <azarmehr65 at gmail.com> wrote:

> 
> Hi Alex
> 
> I'm new in ndnSIM. Could you please give me some hint on how can I measure the RTT for each interest?
> 
> If I got it correct, it seems that "app-delay-tracer" gives this information. But I do not know what does "fulldelay" and "lastdelay" means? I have read the explanation of them from here: http://ndnsim.net/metric.html?highlight=fulldelay 
> 
> but it is very confusing. The delayS and delayUS gives the RTT for "one" interest or they aggregate the delays for all interests from the beginning of simulation? 
> 
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