[Codel] [RFC PATCH] codel: ecn mark at target

[Andrew McGregor]

Well, thanks Eric for trying it.

Hmm.  How was I that wrong?  Because I was supporting that idea.

Time to think.

On 4/08/2012, at 2:53 PM, Kathleen Nichols <nichols at pollere.com> wrote:

> 
> Yes, why would a single delay of more than target be considered
> as a reason to take action? I thought Van did a very nice job of
> explaining this last Monday.
> 
> On 8/3/12 11:45 PM, Eric Dumazet wrote:
>> On Fri, 2012-08-03 at 19:44 -0700, Dave Täht wrote:
>>> From: Dave Taht <dave.taht at bufferbloat.net>
>>> 
>>> The consensus at ietf was that ecn marking should start at
>>> target, and then the results fed into the codel drop scheduler.
>>> 
>>> While I agree with the latter, I feel that waiting an interval
>>> before starting to mark will be more in-tune with the concept
>>> of a sojourn time, and lead to better utilization.
>>> 
>>> As I am outnumbered and outgunned, do it at target.
>> 
>> Well, thats a huge way to favor non ECN flows against ECN flows.
>> 
>> Marking _all_ ECN enabled packets just because last packet sent had a
>> sojourn time above target is going to throttle ECN flows and let non ECN
>> flows going full speed and take whole bandwidth.
>> 
>> Doing so is a nice way to keep users switching to ECN one day.
>> 
>> IETF could just say : ECN is doomed, forget about it, dont even try. 
>> 
>> 
>> 
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> 
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