[Nfd-dev] NDN traffic generator

[Lan Wang (lanwang)]

Just set the freshness period to be the lower than the smallest interval between the Interests.

Lan



On Dec 9, 2014, at 1:44 PM, NAREN N <nnaren1902 at gmail.com<mailto:nnaren1902 at gmail.com>>
 wrote:

Hello,
Yes I believe that is the case. So what would be a good way to get a sense of NFD performance?? Basically, we are trying to stress test the NFD and see when it will start dropping interests. So should I set the freshness period high and the interest lifetime to be low and increase the interest rates?

-Naren

On Tue, Dec 9, 2014 at 11:18 AM, Lan Wang (lanwang) <lanwang at memphis.edu<mailto:lanwang at memphis.edu>> wrote:



On Dec 9, 2014, at 12:57 PM, NAREN N <nnaren1902 at gmail.com<mailto:nnaren1902 at gmail.com>>
 wrote:

Hello everyone,
I was running some experiments for a course project and was using NDN traffic generator to measure of the performance and how each factor contributes to the performance of the NFD.
However, I noticed something weird during the experiments.

When having the interestlifetime=100ms and the freshness period=100ms same between the runs, and also the contents of the data packet being the same, I ran the traffic generator for different burst rates. Here are the rates

>1 interest / second -----> RTT=71ms and InterstLoss = 20%
>10 interests/second------> RTT=27ms and interestLoss = 1%
> 100 interests/second -------> RTT=13ms and interestLoss = 0%
>1000 interests/second ------>RTT=22ms and interestLoss=0%

So I was wondering why would the roundtrip time decrease with increase in Interest rate?? I have a feeling this has something do with the traffic generator logger code, which isn't reporting the RTT properly...

Also I see a interest loss when the Interest rate is lower, which is completely weird. I was expecting the interest loss to be higher when there was a burst of interests but this is opposite to what I was expecting.

Any help would be appreciated with this!

Have you set the option MustBeFresh to be true in the client's configuration file?  If so, your observation is due to your freshness period setting and interval between Interests.  If the sending rate is 1/s, then all of the Interests will have to fetch new data from the producer (because the data is expired when the new Interest comes).  The higher the sending rate, the more likely that the data in the local cache or an intermediate cache is fresh and the Interest does not have to go all the way to the producer.

Lan

regards,
Naren
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