[ndnSIM] how to get the transmission delay

Alex Afanasyev alexander.afanasyev at ucla.edu
Thu May 9 09:18:28 PDT 2013


Propagation delay is just a link delay (the one you configure).
I forgot to mention the transmission delay which is also simulated by NS-3, and which includes queuing delay and delay placing packet bits on the wire.

---
Alex

On May 9, 2013, at 9:03 AM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:

> Thank you Alex. But what does propagation delay include?
> 
> thanks
> 
> My Regards,
> Xiaoke Jiang (蒋小可)
> 
> Ph.D Candidate,
> Dept. of Computer Science and Technology,
> Tsinghua University, P. R. China
> 
> On May 10, 2013, at 12:02 AM, Alex Afanasyev <alexander.afanasyev at ucla.edu> wrote:
> 
>> Hi Xiaoke,
>> 
>> The delays that are observed by app-delay-tracer include everything you mentioned (queuing delay, propagation delay, which is related to packet size), except processing delay.  This exception comes from the fact that in NS-3 unless you specifically simulate processing delay (which requires additional models), each function call, no matter how complex, is running in zero simulation time.
>> 
>> ---
>> Alex
>> 
>> On May 9, 2013, at 8:53 AM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:
>> 
>>> What's more, I am not sure whether the delay includes the router processing time, such as creating PIT entry, Content Store look up , etc.
>>> 
>>> thanks
>>> 
>>> My Regards,
>>> Xiaoke Jiang (蒋小可)
>>> 
>>> Ph.D Candidate,
>>> Dept. of Computer Science and Technology,
>>> Tsinghua University, P. R. China
>>> 
>>> On May 9, 2013, at 11:33 PM, Xiaoke Jiang <shock.jiang at gmail.com> wrote:
>>> 
>>>> Hi all,
>>>> 	I am trying to get the transmission delay with app tracer. But I am not sure what's concluded in the delay. For example, Queuing time on the router, transmitting time on the wire, etc.
>>>> 	Can anyone give me any hints? Thank you in advance.
>>>> 	
>>>> in my file:
>>>>   Config::SetDefault ("ns3::PointToPointNetDevice::DataRate", StringValue ("10Mbps"));
>>>>   Config::SetDefault ("ns3::PointToPointChannel::Delay", StringValue ("1ms"));
>>>> 
>>>> 
>>>> And is the delay related to packet size?
>>>> 
>>>> thanks
>>>> 
>>>> My Regards,
>>>> Xiaoke Jiang (蒋小可)
>>>> 
>>>> Ph.D Candidate,
>>>> Dept. of Computer Science and Technology,
>>>> Tsinghua University, P. R. China
>>> 
>>> _______________________________________________
>>> ndnSIM mailing list
>>> ndnSIM at lists.cs.ucla.edu
>>> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
> 
> _______________________________________________
> ndnSIM mailing list
> ndnSIM at lists.cs.ucla.edu
> http://www.lists.cs.ucla.edu/mailman/listinfo/ndnsim
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.lists.cs.ucla.edu/pipermail/ndnsim/attachments/20130509/5fb559cd/attachment.html>


More information about the ndnSIM mailing list