[Nfd-dev] On the necessity of the STRAGGLER timer

[Seweryn Dynerowicz]

Dear Junxiao,

On 16 November 2016 at 11:28, Junxiao Shi <shijunxiao at email.arizona.edu>
wrote:
>
> Straggler timer delays transferring Nonces from PIT out-records to DNL, in
> order to keep DNL small.
>

>From their definitions, an Out-Record weighs 160 bits while a DNL entry
occupies 64 bits so I assume
you mean "small" in the sense of the number of entries. If the worry is
about lookup time, then isn't
it a matter of improving the data structure underlying the DNL ?


> PIT entry is needed for Data measurements, because strategy needs to know
> which Interest is being satisfied by the incoming Data (recall that
> Interest name is a prefix of Data name and thus may be shorter than the
> Data name), and when that Interest was forwarded (so as to calculate RTT).
> Neither information is available in NameTree.
>

Why does the Strategy need to know that ? The basic behaviour of ICN for
forwarding back DATA is the breadcrumbs, so you only need to send to the
IN-Faces
for the matching PIT entries. How does this differ in NDN ?

Regarding the RTT computation, when incoming Data is received, the
IN-Records (and therefore the specific Interest packets being satisfied)
are removed.
So you only compute the RTT for the first Data packet which satisfies the
Interest, right ? If you're only interested in RTT, the OUT-Records do not
enable you
to do anything useful regarding that so they could be removed straightaway
without waiting for STRAGGLER.


Best regards,

S.

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