[ndnSIM] initial RTO value

[Yaogong Wang]

Hi Alex,

I believe the initial RTO should not be 200ms. According to the code, RTO
is set to m_currentEstimatedRtt + 4 * m_variance bounded by minRto and
maxRto. By default, m_currentEstimatedRtt is initially set to 1s (
InitialEstimation) and m_variance to 0. Hence, the initial RTO should be 1s
which is within minRto=200ms and maxRto=200s.

The current code does set initial RTO to 200ms due to a bug that sets
m_currentEstimatedRtt to 0 initially. I have reported the bug here:
https://github.com/NDN-Routing/ndnSIM/issues/40

Thanks,
Yaogong


On Wed, May 22, 2013 at 4:40 PM, Alex Afanasyev <
alexander.afanasyev at ucla.edu> wrote:

> Hi huyao,
>
> Yes. There is an initial RTO value and it is 200ms.  You can control this
> value by setting "ns3::ndn::RttEstimator::MinRTO" value.  ndnSIM uses a
> modified version of RTT estimator, originally in Internet module:
> https://github.com/NDN-Routing/ndnSIM/blob/master/utils/ndn-rtt-estimator.cc
> .
>
> --
> Alex
>
> On May 22, 2013, at 10:52 AM, yao hu <huyao0107 at gmail.com> wrote:
>
> Hi Alex,
>
> Is there a default initial RTO value for consumer node? RTO should be
> calculated based on the observed RTT samples, but how about the first
> Interest timeout for some reason? If there is a default initial value, is
> it 200ms?
>
> Thanks for your explanation~
>
> Regards,
> huyao
>
>
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-- 
============================
Yaogong Wang, PhD Candidate
Department of Computer Science
North Carolina State University
http://www4.ncsu.edu/~ywang15/
============================
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