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Rather than directly considering the queuing delay of data, this memo focuseson reducing the delay that congestion signals experience within a queuemanagement algorithm, which can be greater than the delay that the data itselfexperiences within the queue. Once the congestion signals are delayed,regulation of the load becomes more sloppy, and the queue tends to overshootand undershoot more as a result, leading the data itself to experience greaterpeaks in queuing delay as well as intermittent under-utilization. Where theservice rate of a queue varies, it is preferable to measure the queue in unitsof time not bytes. However, the size of the queued backlog can be measured inbytes and signalled at the last instant as data leaves the queue, whereasmeasuring queuing delay introduces inherent delay. This paper proposes 'scaledsojourn time', which scales queuing delay by the ratio between the backlogs atdequeue and enqueue. This is equivalent to scaling the sojourn time by theratio of the arrival and departure rates averaged over the time spent in thequeue. The paper also proposes the removal of delays due to randomness in thesignal encoding.

Rapid Signalling of Queue Dynamics