Hi,
My 0.02 EUR:
mark every packet with a sojourn time above target is OK.
The reaction of the congestion controller to ECN marks need to be more
differentiated; ECN can deliver much more fine-grained information about the
current state of the network. If a congestion controller (e.g. legacy 3168
ECN TCP) chooses to overshoot in it's reaction, thats a problem for that
particular controller... But even if every packet of a window is marked, a
legacy TCP will only reduce cwnd once per window, reacting the same as is a
non-ECN had a single drop in that window...
DCTCP (ECN alpha/beta) does things more fine-grained, and would push legacy
(non ECN) out of the way, while maintainig full bandwidth and very low
sojourn time (queue occupancy).
Fixing the reaction of congestion controllers to ECN signals (deliberate
plural) will be the next step in that area...
Best regards,
Richard
----- Original Message -----
From: "Roger Jørgensen" <[email protected]>
To: "Dave Täht" <[email protected]>
Cc: <[email protected]>
Sent: Saturday, August 04, 2012 9:00 AM
Subject: Re: [Codel] [RFC PATCH] codel: ecn mark at target
On Sat, Aug 4, 2012 at 4:44 AM, Dave Täht <[email protected]> wrote:
From: Dave Taht <[email protected]>
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, what do you think is The Best way of doing it? Prove'em wrong if
you really think they are wrong;)
--
Roger Jorgensen | ROJO9-RIPE
[email protected] | - IPv6 is The Key!
http://www.jorgensen.no | [email protected]
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