[Cake] fragmenting for lowest per flow latency

[Dave Taht]

(I should probably create an alias for the crazy ideas like "devnull")

but I have kind of wondered just how bad the fragmentation problem really was,
and with peeling, already, we could also add fragmentation support, to
create tons of fragments... and see what breaks, and get even lower
per small packet flow latency when larger packets were present.

I actually have a use case for this personally in that dnssec's rules
(eDNS0) for fragmentation were a real pain in the arse of late, and
*knowing* devices we work on handle fragments appropriately would be
nice.

-- 
Dave Täht
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