[NNagain] Flash priority

[rjmcmahon]

I should note that I haven't evaluated ECN marks, just that 45 gets 
passed to/fro

Bob
>> [JL] Quite true: each network tends to use DSCP marks on a
>> private/internal basis and so will bleach the DSCP marks on ingress
>> from peers. This will, however, change with the upcoming IETF RFC on
>> Non-Queue-Building (NQB) Per Hop Behavior -
>> https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-nqb. And I can
>> report that we at Comcast now permit DSCP-45 inbound for NQB packets,
>> in case developers would like to experiment with this (we just
>> finished updating router configs last week for residential users on
>> DOCSIS; FTTP and commercial are still in process).
> 
> iperf 2 now supports a --dscp option as a convenience (vs setting the
> --tos byte.) I can confirm --dscp 45 is being passed over my xfinity
> hop to my linodes (now Akamai) servers in both directions at multiple
> colo locations.
> 
> The --dscp is in the master branch.
> https://sourceforge.net/p/iperf2/code/ci/master/tree/  Older versions
> require --tos and setting the byte, e.g. 180
> 
> Bob
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