[Nfd-dev] RTT delay caused by RIB registration commands

Wed May 6 17:04:13 PDT 2015

Hi Vince

Summary from your logs:

   1. NFD=RSA, ndn::nfd::Controller=RSA: min 7.098ms, max 52.041ms
   2. NFD=SHA256, ndn::nfd::Controller=RSA: min 7.277ms, max 40.540ms
   3. NFD=SHA256, ndn::nfd::Controller=SHA256: min 7.732ms, max 12.022ms

This shows a correlation between signing algorithm and max RTT, but the
variance is much larger compared to the logs from Apr 23.
Are you using a different machine?
How many CPU cores does this machine have? There shouldn't be much
difference between 2 and 3 on a quad-core machine.

Also, please confirm you have changed ".sign(" to ".signWithSha256(" in all
these files for "NFD Management":

   - NFD/core/segment-publisher.hpp (for answering face query; unnecessary
   if nfdc is using a FaceId)
   - NFD/core/notification-stream.hpp (for generating face status change
   notifications)
   - NFD/daemon/mgmt/manager-base.cpp (for answering commands)

Yours, Junxiao

On Wed, May 6, 2015 at 4:04 PM, Vince Lehman (vslehman) <
vslehman at memphis.edu> wrote:

>  At the NFD call today, it was suggested that I try our experiments with a
> different, quicker signing method for NFD’s management modules.
>
>  I ran the following three tests:
>
>  1.) Unmodified NFD to get baseline results
> 2.) NFD with management modules using KeyChain::signWithSha256 for control
> responses
> 3.) Test 2 + modified ndn::nfd::Controller in ndn-cxx so control commands
> are signed using KeyChain::signWithSha256
>
>  The results I collected suggest that signing is largely the cause of the
> RTT jumps.
>
>  1. ) Unchanged NFD using KeyChain::sign():
>
>  20150506T220013.546312 - Content From /ndn/edu/orange - Ping Reference =
> 358723384   - Round Trip Time = 7.54174 ms
> 20150506T220014.545910 - Content From /ndn/edu/orange - Ping Reference =
> 358723385   - Round Trip Time = 7.35931 ms
> 20150506T220015.549327 - Content From /ndn/edu/orange - Ping Reference =
> 358723386   - Round Trip Time = 10.755 ms
> 20150506T220016.569095 - Content From /ndn/edu/orange - Ping Reference =
> 358723387   - Round Trip Time = 26.909 ms
> 20150506T220017.554450 - Content From /ndn/edu/orange - Ping Reference =
> 358723388   - Round Trip Time = 15.8414 ms
> 20150506T220018.550272 - Content From /ndn/edu/orange - Ping Reference =
> 358723389   - Round Trip Time = 11.7576 ms
> 20150506T220019.594078 - Content From /ndn/edu/orange - Ping Reference =
> 358723390   - Round Trip Time = 52.0413 ms
> 20150506T220020.572899 - Content From /ndn/edu/orange - Ping Reference =
> 358723391   - Round Trip Time = 31.8473 ms
> 20150506T220021.568606 - Content From /ndn/edu/orange - Ping Reference =
> 358723392   - Round Trip Time = 29.9206 ms
> 20150506T220022.545620 - Content From /ndn/edu/orange - Ping Reference =
> 358723393   - Round Trip Time = 7.09895 ms
> 20150506T220023.551988 - Content From /ndn/edu/orange - Ping Reference =
> 358723394   - Round Trip Time = 13.4654 ms
> 20150506T220024.564711 - Content From /ndn/edu/orange - Ping Reference =
> 358723395   - Round Trip Time = 26.1983 ms
> 20150506T220025.590458 - Content From /ndn/edu/orange - Ping Reference =
> 358723396   - Round Trip Time = 51.8421 ms
> 20150506T220026.547079 - Content From /ndn/edu/orange - Ping Reference =
> 358723397   - Round Trip Time = 8.38067 ms
> 20150506T220027.546382 - Content From /ndn/edu/orange - Ping Reference =
> 358723398   - Round Trip Time = 7.7887 ms
>
>  2.) NFD Management using KeyChain::signWithSha256() for control
> responses:
>
>  20150506T220832.990110 - Content From /ndn/edu/orange - Ping Reference =
> 481750786   - Round Trip Time = 8.12952 ms
> 20150506T220833.989616 - Content From /ndn/edu/orange - Ping Reference =
> 481750787   - Round Trip Time = 7.27718 ms
> 20150506T220835.000043 - Content From /ndn/edu/orange - Ping Reference =
> 481750788   - Round Trip Time = 17.7199 ms
> 20150506T220835.997854 - Content From /ndn/edu/orange - Ping Reference =
> 481750789   - Round Trip Time = 15.8593 ms
> 20150506T220836.990831 - Content From /ndn/edu/orange - Ping Reference =
> 481750790   - Round Trip Time = 8.84247 ms
> 20150506T220838.011070 - Content From /ndn/edu/orange - Ping Reference =
> 481750791   - Round Trip Time = 17.0122 ms
> 20150506T220839.022594 - Content From /ndn/edu/orange - Ping Reference =
> 481750792   - Round Trip Time = 40.5401 ms
> 20150506T220839.996497 - Content From /ndn/edu/orange - Ping Reference =
> 481750793   - Round Trip Time = 13.9247 ms
> 20150506T220841.000317 - Content From /ndn/edu/orange - Ping Reference =
> 481750794   - Round Trip Time = 18.0118 ms
> 20150506T220841.990391 - Content From /ndn/edu/orange - Ping Reference =
> 481750795   - Round Trip Time = 8.36782 ms
> 20150506T220842.989631 - Content From /ndn/edu/orange - Ping Reference =
> 481750796   - Round Trip Time = 7.57163 ms
> 20150506T220843.990083 - Content From /ndn/edu/orange - Ping Reference =
> 481750797   - Round Trip Time = 7.9309 ms
>
>  3.) NFD Management using KeyChain::signWithSha256() and
> ndn::nfd::Controller::start() using KeyChain::signWithSha256:
>
>  20150506T224746.920419 - Content From /ndn/edu/orange - Ping Reference =
> 432571709   - Round Trip Time = 7.74707 ms
> 20150506T224747.920684 - Content From /ndn/edu/orange - Ping Reference =
> 432571710   - Round Trip Time = 8.08427 ms
> 20150506T224748.921073 - Content From /ndn/edu/orange - Ping Reference =
> 432571711   - Round Trip Time = 7.95967 ms
> 20150506T224749.920619 - Content From /ndn/edu/orange - Ping Reference =
> 432571712   - Round Trip Time = 7.78507 ms
> 20150506T224750.923189 - Content From /ndn/edu/orange - Ping Reference =
> 432571713   - Round Trip Time = 10.5592 ms
> 20150506T224751.920660 - Content From /ndn/edu/orange - Ping Reference =
> 432571714   - Round Trip Time = 7.73255 ms
> 20150506T224752.920939 - Content From /ndn/edu/orange - Ping Reference =
> 432571715   - Round Trip Time = 8.24211 ms
> 20150506T224753.923819 - Content From /ndn/edu/orange - Ping Reference =
> 432571716   - Round Trip Time = 9.19251 ms
> 20150506T224754.921798 - Content From /ndn/edu/orange - Ping Reference =
> 432571717   - Round Trip Time = 8.94248 ms
> 20150506T224755.924729 - Content From /ndn/edu/orange - Ping Reference =
> 432571718   - Round Trip Time = 12.0222 ms
> 20150506T224756.920302 - Content From /ndn/edu/orange - Ping Reference =
> 432571719   - Round Trip Time = 7.75629 ms
>
>
> --
>  Vince Lehman
>
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