[Codel] [PATCH 1/2] codel: Controlled Delay AQM

[Dave Taht]

On Mon, May 7, 2012 at 11:32 AM, Jim Gettys <jg at freedesktop.org> wrote:
> On 05/07/2012 01:52 PM, Dave Taht wrote:
>> ecn:
>>
>> ecn was not in the paper (and it's working well) and I'd like to live
>> in a world where ecn was the default. I think. Others disagree.
>>
>> so perhaps ecn and noecn? And ecn be the default (after some serious testing?)
>>
> I think noecn *must* be the default at the moment.  There is still too
> much brokenness out there (though it is improving); Steve Bauer can
> enlighten us how much.

Possibly influenced by how hard it is to cycle builds on embedded
hardware and test one thing at a time,
as well as the space program's major success at shortening the path to
the moon, I am an advocate of all-up-testing.

http://www.nasa.gov/offices/oce/appel/ask-academy/issues/ask-oce/AO_1-7_F_snapshot.html

Going with ecn enabled by default, and being aware that it might cause
problems, will
result in less time being spent testing each individually.

I note that on an ingress qdisc ecn has mildly less risk as it only
tests the router and host device.

On egress, yes, you're testing the whole internet.


>                        - Jim
>



-- 
Dave Täht
SKYPE: davetaht
US Tel: 1-239-829-5608
http://www.bufferbloat.net