[ndnSIM] limitations at router or channels?

[John Baugh]

I'm still struggling with finding what is causing this behavior.

Any suggestions would be welcome.

Thank you all



On Jun 15, 2017 5:32 AM, "John Baugh" <jpbaugh at umich.edu> wrote:

> Greetings friends,
>
> This is probably something simple, but I'm just not able to figure it out.
>
> I've created:
>
>    - 8 consumers
>       - All of their CS limits are set to 0 so they won't cache anything
>       themselves
>       - This is to ensure that they will keep requesting the same objects
>       over and over again so I can look at the router's incoming frequency of
>       interests
>    - 1 router
>       - This does have a CS limit set to a positive number (5, 10, etc. -
>       doesn't seem to matter)
>    - 1 producer
>    - 2 "intermediate nodes" with neither a consumer or producer app
>    helper installed
>       - I've set their cache limit to 0, just like the consumers
>
> *I run the app for 30 simulator seconds.*
>
> Here is what I'm getting in 2 different scenarios:
>
>
>    1. In scenario 1, I don't use the "intermediate nodes" at all.  I
>    connect all 8 consumers directly to the router, and then the router to the
>    producer
>
>    Given a rate of 30 (Frequency attribute set to 30), The frequency of
>    requests for the same content object coming in are 900 from each Face.  *This
>    is what I expect*.
>
>    2. In scenario 2, I connect 4 consumers to intermediate node 1, and 4
>    consumers to intermediate node 2.  Then, the intermediate nodes are
>    directly connected to the "router", and the router is connected to the
>    producer.
>
>    Given the same rate (30), running the app for 30 seconds, and knowing
>    that I only have two incoming faces to the router (one from each
>    intermediate node), the frequency of requests for content objects coming in
>    is 450 for each of the links.
>
> While I suspect the "450" from each link * 2 = 900 has some connection to
> this whole situation, I'm a little confused.  If *each of the consumers *is
> requesting a content object at 30 / second, for 30 seconds, *each
> consumer* is requesting that object *900 times*.  This shouldn't change
> between scenarios 1 and 2.
>
> Therefore, if there are two links involved here, I expect the same overall
> requests (8 consumers * 900 = 7,200 overall interests being received at the
> router.  So half (3,600) should be coming in to Intermediate node 1, and
> forwarded to the router, and the other have (3,600) should be coming in
> from Intermediate node 2, and forwarded to the router.
>
> But in scenario (2), I'm only getting a total of 900 overall interests
> received!  I tried modifying the link speed and other attributes like that
> but it doesn't seem to do anything.
>
> Ideas?
>
> John
>
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