It has been a while since I have posted about this, and there are some updates 
to highlight.
See below for the IPv6 and IPv4 versions of "IP Parcels and Advanced Jumbos 
(AJs)":

https://datatracker.ietf.org/doc/draft-templin-6man-parcels2/
https://datatracker.ietf.org/doc/draft-templin-intarea-parcels2/

The documents acknowledge that parcels are analogous to Generic Segment/Receive 
Offload
(GSO/GRO) but taken to the ultimate aspiration of encapsulating multi-segment 
buffers in
{TCP/UDP}/IP headers for transmission over parcel-capable network paths. They 
further give
a name to the multi-segment buffers used by GSO/GRO, suggesting that they be 
called
"parcel buffers" or simply "parcels".

AJs are simply single-segment parcels that can range in size from very small to 
very large.
They differ from ordinary jumbograms in several important ways, most notably in 
terms
of integrity verification and error correction. They also suggest a new link 
service model
that defers integrity checks to the end systems where bad data can be discarded 
while
good data can be accepted as an end-to-end function, reducing retransmissions.

Together, these documents cover all possible packet sizes and configurations 
that may
be necessary both in the near term and for the foreseeable future for 
Internetworking
performance maximization . Comments on the list(s) are welcome.

Fred Templin
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