[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
>
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