On Fri, Jun 10, 2022 at 11:41 AM 'Bob McMahon' via BBR Development
<
bbr...@googlegroups.com> wrote:
>
> Hi All,
>
> A question for the transport experts. Let's say an intermediate forwarding plane device determined a packet requiring low latency was going to be late, would the best action be to set ECN bits and forward it so ECN could pace the source or rather immediately drop the packet?
A packet not marked as ECN capable (neither ECT1 and ECT0 set) MUST
NOT be marked with ECN, but dropped. In RFC3168 ECN a drop is
considered equivalent to a mark.
There isn't a distinct notion of "this packet needs low latency" baked
into RFC3168-style ECN. The concept was reserved for explicit diffserv
markings, or in my (FQ'd) world, "sparseness"). So I might argue with
a CS4 + ECN mark that it might still be better to drop rather than
mark.
L4S-style ECN is supposed to land in short queues by default, and the
folk over there never want to drop a packet ever.
> Thanks,
> Bob
>
>
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--
FQ World Domination pending:
https://blog.cerowrt.org/post/state_of_fq_codel/
Dave Täht CEO, TekLibre, LLC