The CoDel control_law is defined as 't + interval/sqrt(count)'
The sample implementation (http://queue.acm.org/appendices/codel.html) suggests
that sqrt(count) can be calculated using only integer multiplication, but I'm
wondering if it even needs to be calculated.
Would it not be more efficien
the Linux
implementation's approach is likely more efficient.
--Jeff
From: Agarwal, Anil [anil.agar...@viasat.com]
Sent: Monday, August 10, 2015 2:38 PM
To: Jeff Weeks; aqm@ietf.org
Subject: RE: avoiding the sqrt
Jeff,
Did you mean -
pre-calculate a set o
Hello,
There exists a short-circuit into a "deeper" drop state if we were previously
and recently in a drop state. I understand the need for this, but I'm curious
where the '16' came from? How was this decided upon?
For example, here's the ns3 implementation:
/*
* if min
I don't believe codel does start fresh; there are various back-off mechanisms
that have been employed in the management of 'count' such that if the drop
state is entered soon after it previously left the drop state, it'll re-enter
at close to the same interval.
I believe these mechanisms were p
Getting back to this...
Bob; I agree. Seems that the further we are from the target, the coarser the
adjustments should be towards the target (and therefore, in codel, the larger
increments of count, leading to larger reduction of the interval).
One problem is large modifications of 'count' in
The drop rate is affected by sojourn time, yes, but a 2x sojourn time goes
through the same incremental reduction of interval size, as does a sojourn time
of x.
In investigating codel, I've setup various worst case scenarios, and I feel
like the algorithm could be made better by having its resp
Hello all,
I'm wondering if there's some data on Codel with low shape rates?
In particular, I'm talking about in the kbps ranges.
In my investigation, it seems as though the algorithm can't control latency as
effectively.
For one, the algorithm requires 2 packets in the queue to operate, but a
I definitely see more consistent results at 4Mbps+
--Jeff
/dev/jeff_weeks.x2936
Sandvine Incorporated
From: Agarwal, Anil [anil.agar...@viasat.com]
Sent: Tuesday, January 19, 2016 8:43 AM
To: Dave Täht; Jeff Weeks; aqm@ietf.org
Cc: c..
