[ndnSIM] [EXT]Re: customise PIT size

Sai Gautam Mandapati saigautam96 at gmail.com
Sat Jun 25 13:40:06 PDT 2022


Hi Junxiao,

Thank you for the explaination. I have one last question. If I want enforce
PIT capacity limit is there anyway I can do that? Please let me know.
Thanks once again.


On Sun, 26 Jun 2022 at 12:39 am, Junxiao Shi <shijunxiao at email.arizona.edu>
wrote:

> Hi Sai
>
> The forwarding plane in ndnSIM does not enforce PIT capacity limit.
> Every unsatisfied Interest will stay in the PIT until InterestLifetime has
> elapsed.
> If the host machine has insufficient RAM to accommodate these PIT entries,
> the simulation crashes.
>
> If a forwarder is enforcing PIT capacity limit, having too many
> unsatisfied Interests would either cause new Interests to be rejected or
> cause old PIT entries to be evicted, depending on the design of the
> forwarding plane.
>
> Yours, Junxiao
>
>
> On Fri, Jun 24, 2022, 18:45 Sai Gautam Mandapati <saigautam96 at gmail.com>
> wrote:
>
>> *External Email*
>>
>> So, suppose my network and producer are not able to statisfy the consumer
>> interest. Unsatisfied interests increase the PIT size. In that case would
>> flooding be even possible?
>>
>>
>> On Sat, 25 Jun 2022 at 8:29 am, Junxiao Shi <shijunxiao at email.arizona.edu>
>> wrote:
>>
>>> Hi Sai
>>>
>>> If InterestLifetime is absent in the packet, it's equivalent to setting
>>> it to 4000ms.
>>>
>>> If the consumer transmits Interests more frequently,
>>> * If the network & producer can satisfy these Interests quickly, PIT
>>> size remains small.
>>> * If some Interests are unsatisfied, PIT size increases.
>>>
>>> Yours, Junxiao
>>>
>>> On Fri, Jun 24, 2022, 18:23 Sai Gautam Mandapati <saigautam96 at gmail.com>
>>> wrote:
>>>
>>>> *External Email*
>>>> Hi Junxiao,
>>>>
>>>> Thanks for your reply. If that is the case if I remove the lifetime of
>>>> interest attribute and increase the frequency of packets with random
>>>> content would I be able to achieve PIT flooding?
>>>>
>>>> Thanks,
>>>> Sai.
>>>>
>>>> On Sat, 25 Jun 2022 at 7:33 am, Junxiao Shi <
>>>> shijunxiao at email.arizona.edu> wrote:
>>>>
>>>>> Hi Sai
>>>>>
>>>>> As defined in NDN protocol, the PIT entry is deleted under these two
>>>>> conditions, whichever occurs earlier:
>>>>>
>>>>>    - Incoming Data packet satisfies the PIT entry.
>>>>>    - InterestLifetime has elapsed since the last time an Interest
>>>>>    matching the PIT entry is received.
>>>>>
>>>>> Hence,
>>>>>
>>>>>    - If the Interests are being satisfied by Data, InterestLifetime
>>>>>    does not affect PIT size much.
>>>>>    - If the Interests are not being satisfied, higher
>>>>>    InterestLifetime results in larger PIT size.
>>>>>
>>>>>
>>>>> Yours, Junxiao
>>>>>
>>>>> On Sun, Jun 19, 2022 at 9:12 AM Sai Gautam Mandapati <
>>>>> saigautam96 at gmail.com> wrote:
>>>>>
>>>>>> *External Email*
>>>>>>
>>>>> Hi everyone,
>>>>>>
>>>>>> From the previous PIT size-related email lists. I found that from
>>>>>> ndnsim 2.0, nfd is used for PIT and custom fields for PIT have been removed
>>>>>> further. I see that interest lifetime is the same as PIT entry time. In my
>>>>>> simulation, I set the Lifetime, but I don't know how exactly this is
>>>>>> influencing the PIT. Is there any way I can see what's happening after the
>>>>>> interest LIfeTime for PIT? Please help me out. Thank you.
>>>>>>
>>>>>> --
>>>>>> Sai Gautam
>>>>>>
>>>>> --
>>>> Sai Gautam
>>>>
>>> --
>> Sai Gautam
>>
> --
Sai Gautam
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