Re: [Bloat] this explains speedtest stuff

[Dave Taht <dave.taht@gmail.com>]

in /etc/config/sqm, with fq_codel, you need to uncomment or enter the
following lines

        option ingress_ecn 'ECN'
        option egress_ecn 'ECN'

I still am not much of an ecn fan. I use it primarily for debugging
codel. :/ When I see marking, I know its working,
and if I see loss where I shouldn't, I know something else in the
stack is broken somewhere.

Example - I ran into this while trying to get the ath10k performing
sanely: https://forum.openwrt.org/t/aql-and-the-ath10k-is-lovely/59002/92
- dropping packets elsewhere in the stack. The "fix" got bidir
throughput up by 10x, and it's still 4x lower than it could be for...
unknown reasons.

I worry a lot about checksummng problems and incorrect encapsulation.
Hit that multiple times myself, and most recently a ddpk person hit
it. "Look ecn's enabled!" but the actual receiver was dropping it
instead because the checksum was wrong. I also hit it with 6 months of
data from all over the world on osx. The second and successive runs of
the rrul test disabled ecn neg attempts entirely for those ip
addresses. I didn't figure it out until
I sat down to write the paper and was agast at my packet captures.

osx is completely useless for evaluating ecn behaviors given the
heuristics in place on it today.

Would love to have one valid windows + openvpn + fq_codel result.

On Sat, Apr 25, 2020 at 10:37 AM Jonathan Morton <chromatix99@gmail.com> wrote:
>
> > On 25 Apr, 2020, at 8:24 pm, Y via Bloat <bloat@lists.bufferbloat.net> wrote:
> >
> > ECN on
> > http://www.dslreports.com/speedtest/62823326
> > ECN off
> > http://www.dslreports.com/speedtest/62823112
>
> Yup, that's what I mean.
>
> > doesn't appear to have worked. retransmits are still high.
>
> Ken, it might be that your version of fq_codel doesn't actually have ECN support on by default.  So try adding the "ecn" keyword to the qdisc.
>
>  - Jonathan Morton
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> Bloat@lists.bufferbloat.net
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-- 
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Dave Täht
CTO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-831-435-0729