[Ndn-interest] NDN packet size

[Nick Briggs]

And one other that we found to be a bit of a headache --

$ uname -a
FreeBSD pigeon 11.0-RELEASE-p8 FreeBSD 11.0-RELEASE-p8 #0: Wed Feb 22 06:06:13 UTC 2017     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC  i386
$ sysctl net.inet.udp.maxdgram
net.inet.udp.maxdgram: 9216

$ uname -a
Darwin silversword 15.6.0 Darwin Kernel Version 15.6.0: Fri Feb 17 10:21:18 PST 2017; root:xnu-3248.60.11.4.1~1/RELEASE_X86_64 x86_64
$ sysctl net.inet.udp.maxdgram
net.inet.udp.maxdgram: 9216

I don't happen to have a Linux box handy to check there.

> On Mar 28, 2017, at 2:45 PM, Klaus Schneider <klaus at cs.arizona.edu> wrote:
> 
> Those are all good reasons. Thanks for the clarification.
> 
> Klaus
> 
> On 03/28/2017 02:40 PM, Nick Briggs wrote:
>> It gets you 8K bytes of data along with necessary metadata and a name that isn't too long in a Content packet.
>> It can be encapsulated in a UDP packet with about 6 fragments when you're do IP encapsulation. (max UDP is 64K bytes)
>> It fits within a 9000 byte jumbo ethernet frame if you're doing direct ethernet encapsulation.
>> 
>> -- Nick Briggs
>> 
>>> On Mar 28, 2017, at 2:35 PM, Klaus Schneider <klaus at cs.arizona.EDU> wrote:
>>> 
>>> Btw, what was the reason for setting the default max packet size to 8800 in the first place?
>>> 
>>> Is there any drawback to increasing the default, to let's say 1 Megabyte?
>>> 
>>> Best regards,
>>> Klaus
>>> 
>>> 
>>> 
>>> On 03/28/2017 02:01 PM, Alex Afanasyev wrote:
>>>> The new ndn-cxx needs to be recompiled and installed, after which all
>>>> other tools and code needs to be recompiled and reinstalled.
>>>> 
>>>> The packet size is used as a compile-time constant in several places
>>>> (definitely in NFD, not sure about tools), which requires such
>>>> recompilation.
>>>> 
>>>> --
>>>> Alex
>>>> 
>>>>> On Mar 28, 2017, at 3:55 PM, Thompson, Jeff <jefft0 at remap.UCLA.EDU
>>>>> <mailto:jefft0 at remap.UCLA.EDU>> wrote:
>>>>> 
>>>>> A question to the NFD team: To increase the packet size, is it
>>>>> necessary to recompile/install ndn-cxx, then recompile/install NFD?
>>>>> - Jeff T
>>>>> 
>>>>> From: Mohammad Alhowaidi <malhowaidi at gmail.com
>>>>> <mailto:malhowaidi at gmail.com>>
>>>>> Date: Tuesday, March 28, 2017 at 13:53:00
>>>>> To: Jeff Thompson <jefft0 at remap.ucla.edu <mailto:jefft0 at remap.ucla.edu>>
>>>>> Cc: "Spyridon (Spyros) Mastorakis" <mastorakis at cs.ucla.edu
>>>>> <mailto:mastorakis at cs.ucla.edu>>, "ndn-interest at lists.cs.ucla.edu
>>>>> <mailto:ndn-interest at lists.cs.ucla.edu>"
>>>>> <ndn-interest at lists.cs.ucla.edu <mailto:ndn-interest at lists.cs.ucla.edu>>
>>>>> Subject: Re: [Ndn-interest] NDN packet size
>>>>> 
>>>>> I am using ndn-cxx and running the ndn-tool code ( chunks). and yes I
>>>>> am sending it through NFD.
>>>>> 
>>>>> Thanks,
>>>>> Mohammad
>>>>> 
>>>>> On Tue, Mar 28, 2017 at 3:50 PM, Thompson, Jeff <jefft0 at remap.ucla.edu
>>>>> <mailto:jefft0 at remap.ucla.edu>> wrote:
>>>>>> Which library are you using? And are you sending the packet through NFD?
>>>>>> - Jeff T
>>>>>> 
>>>>>> From: Ndn-interest <ndn-interest-bounces at lists.cs.ucla.edu
>>>>>> <mailto:ndn-interest-bounces at lists.cs.ucla.edu>> on behalf of
>>>>>> Mohammad Alhowaidi <malhowaidi at gmail.com <mailto:malhowaidi at gmail.com>>
>>>>>> Date: Tuesday, March 28, 2017 at 13:47:00
>>>>>> To: "Spyridon (Spyros) Mastorakis" <mastorakis at CS.UCLA.EDU
>>>>>> <mailto:mastorakis at CS.UCLA.EDU>>
>>>>>> Cc: "ndn-interest at lists.cs.ucla.edu
>>>>>> <mailto:ndn-interest at lists.cs.ucla.edu>"
>>>>>> <ndn-interest at lists.cs.ucla.edu <mailto:ndn-interest at lists.cs.ucla.edu>>
>>>>>> Subject: Re: [Ndn-interest] NDN packet size
>>>>>> 
>>>>>> I updated the file with value 32767 but it gives me the following error
>>>>>> 
>>>>>> ERROR: Data size exceeds maximum limit
>>>>>> 
>>>>>> Thanks,
>>>>>> Mohammad
>>>>>> 
>>>>>> On Tue, Mar 28, 2017 at 1:03 PM, Spyridon (Spyros) Mastorakis
>>>>>> <mastorakis at cs.ucla.edu <mailto:mastorakis at cs.ucla.edu>> wrote:
>>>>>>> Hi,
>>>>>>> 
>>>>>>> you can change this constant in the ndn-cxx library:
>>>>>>> 
>>>>>>> https://github.com/named-data/ndn-cxx/blob/e78eeca5cc6c882ea1c72daaffc7678bf42f526b/src/encoding/tlv.hpp#L37
>>>>>>> <https://github.com/named-data/ndn-cxx/blob/e78eeca5cc6c882ea1c72daaffc7678bf42f526b/src/encoding/tlv.hpp#L37>
>>>>>>> 
>>>>>>> Not clear to me if there will be further issues because of this
>>>>>>> change though.
>>>>>>> 
>>>>>>> Hope that this helps,
>>>>>>> 
>>>>>>> Spyridon (Spyros) Mastorakis
>>>>>>> Personal Website: http://cs.ucla.edu/~mastorakis/
>>>>>>> <http://cs.ucla.edu/%7Emastorakis/>
>>>>>>> Internet Research Laboratory
>>>>>>> Computer Science Department
>>>>>>> UCLA
>>>>>>> 
>>>>>>>> On Mar 28, 2017, at 11:02 AM, Mohammad Alhowaidi
>>>>>>>> <malhowaidi at gmail.com <mailto:malhowaidi at gmail.com>> wrote:
>>>>>>>> 
>>>>>>>> Hello,
>>>>>>>> 
>>>>>>>> I was wondering how to increase NDN packet size, instead of using
>>>>>>>> 8K? and is there any limitation from increasing it?
>>>>>>>> 
>>>>>>>> Thanks,
>>>>>>>> Mohammad
>>>>>>> 
>>>>>> 
>>>>> 
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>>>> 
>>>> 
>>>> 
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