[Roll] ghc-02 vs grrc-00 examples

[Michael Richardson <[e-mail]>]

In case you haven't read both 
            draft-goyal-roll-rpl-compression-00
and         draft-bormann-6lowpan-ghc-02

here are the numbers listedn for ROLL examples:

GRRC:
   DIO: started at 87 bytes; compressed to 48 bytes, compression factor 1.81
   DIO: started at 89 bytes; compressed to 50 bytes, compression factor 1.78

GHC:
   DIO: started at 92 bytes; compressed to 53 bytes, compression factor 1.74
   DAO: started at 50 bytes; compressed to 27 bytes, compression factor 1.85
   ND:  started at 48 bytes; compressed to 26 bytes, compression factor 1.85

The compression rates are almost identical, and this is without using
GHC's "contexts", which as far as I can tell is not well enough
documented to understand.

What I do not know if how the two sample packets compare: are they even
close to expressing the same thing.

In particular the GRRC document does not list the *actual* packet
contents, since GRRC is not sensitive to the actual field contents.
As such I will be taking Bormann's packets, plus some from Contiki. 
(Hmm. I only brought one econotag to the cottage)

<TCPDUMP-MAINTAINER>
IF YOU HAVE PCAP TRACES OF ROLL PACKETS PLEASE SEND THEM, AS MY SAMPLES
ARE TOO SIMPLE!!!
</TCPDUMP-MAINTAINER>

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