If you have high RTT on loopback or virtual interfaces, Codel is going to be the 
least of your problems ;-)

David Lang

On Tue, 28 Jul 2015, Simon Barber wrote:

> The main danger is the negative effects on performance of using Codel. You 
> may experience low throughput on high RTT links.
>
> Simon
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> On July 28, 2015 7:06:22 AM Toke Høiland-Jørgensen <toke@toke.dk> wrote:
>
>> Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr> writes:
>>
>> >> What distro are you on?
>> >
>> > Debian.  (One machine stable, one testing.)
>>
>> Right. Don't know if there's already an effort to convince the Debian
>> devs to switch the default...
>>
>> >> Set this to fq_codel and you should be good to go.
>> >
>> > Is that safe?  I'm thinking lo and virtual interfaces.
>>
>> Why wouldn't it be? The lo interface doesn't have a queue at all AFAIK.
>> And if you have congestion at your virtual interfaces wouldn't you want
>> it de-bloated? :)
>>
>> -Toke
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