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

Andrew McGregor andrewmcgr at gmail.com
Mon Aug 6 15:09:10 EDT 2012

On 6/08/2012, at 10:50 AM, Dave Taht <dave.taht at gmail.com> wrote:

> This discussion is getting mildly off-track. My intent in posting this patch
> was to prove how wrong the "ecn mark at target" idea was by example,
> and in doing so, shed light on those new to codel, on how the algorithm
> actually works, and to encourage those that didn't grok it, to read and
> run the code in whatever scenarios would help more people to
> grokking in fullness.
> I hadn't expected to twiddle a bug!

Well, so drop at target is wrong wrt deployed TCPs.  Ok, fine.

So, instead, how about this: mark instead of dropping, but only for the first few iterations around the while loop in dequeue (so that huge backlogs can be drained).  The question then is, how many is a few?  I suppose that can be answered empirically.

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