On Fri, 20 Mar 2015, John Leslie wrote:
If you do #2, then flows with ECN effectively get priority over flows
without ECN
It's not "priority". It's an occasional packet which gets through
instead of being dropped.
is it? or is it that in order to keep the link from being congeted, flows with
ECN marked (but not honored) will consistantly get more packets through than
ones wihtout ECN?
If it' just an occasional packet, it's not a big deal, but if the non-ECN flows
get slowed more because the ECN-marked flows are getting more packet through,
that's a priority difference, not just an occasional packet.
I wrote this based on the responses of "how could anyone game ECN" where people
seemed to be thinking that there is no way to gain an advantage from claiming to
do ECN but then ignoring the congestion signals.
It may be that nobody ever abuses ECN this way, but when introducing something
new we need to look at ways that it could be abused and what the effects of
someone trying to abuse it would be.
David Lang
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