Re: [aqm] [tcpm] ECN support and usage on the Internet

You need to distinguish 1) "Will talk ECN when talked to", from 2) "Will
initiate an ECN conversation".

Linux, for example, will do 1) by default (and has for some time now), but
requires configuration to turn on ECN when initiating a connection.
                                  - Jim

On Tue, Mar 19, 2013 at 10:45 AM, Rick Jones <rick.jones2@hp.com> wrote:

> On 03/19/2013 02:22 AM, Mikael Abrahamsson wrote:
>
>> On Tue, 19 Mar 2013, Mirja Kühlewind wrote:
>>
>>  Do we need to start a campaign to further encourage greater ECN
>>> support (also of network providers)? Asking the content providers on
>>> the list(s): What are the reasons to not enable ECN support?
>>>
>>
>> Let me speculate:
>>
>> It's not on by default in Windows. There is little reason to turn it on,
>> because "nobody" acts on ECN, and nobody acts on ECN because there is no
>> demand for AQM, and even if there was AQM, it would most likely not be
>> ECN enabled.
>>
>
> Out of curiosity, which stacks have ECN enabled by default?  To my
> recollection, on netperf.org I had to explicitly enable TCP's use of ECN
> in the kernel which ships with Ubuntu 12.04.
>
> rick jones
>
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