[ndnSIM] [EXT]Re: customise PIT size

Sai Gautam Mandapati saigautam96 at gmail.com
Sat Jun 25 18:13:06 PDT 2022

Thank you for your explanation Junxiao. Overall, If I set the
InterestLifetime higher PIT entries will stay longer as the elapsed time is
increased. Sorry, this brings me to another question. Do you know if I can
track the PIT size over my simulation? I added a statement in my forwarder
that returns me the PIT size throughout my simulation time with the
particular interest at that point in time. I need a statement that returns
me router-specific PIT entry information.

On Sun, Jun 26, 2022 at 8:03 AM Junxiao Shi <shijunxiao at email.arizona.edu>

> Hi Sai
> ndnSIM uses NFD as its forwarding plane.
> It does not support limiting PIT capacity.
> To prevent crashing the simulation scenario, you should either reduce
> sending rate or use a host machine with more RAM, so that you have enough
> RAM for all the PIT entries.
> NDN-DPDK is the only NDN forwarder that can limit PIT capacity, but it is
> not possible to run NDN-DPDK within ns-3 or ndnSIM.
> Yours, Junxiao
> On Sat, Jun 25, 2022 at 4:40 PM Sai Gautam Mandapati <
> saigautam96 at gmail.com> wrote:
>> *External Email*
>> 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

Sai Gautam
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