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Controlling Bufferbloat with Queue Delay

CowboyRobot (671517) writes | more than 2 years ago

The Internet 0

CowboyRobot writes "We all can see that the Internet is getting slower. According to researchers, the cause is persistently full buffers, and the problem is only made worse by the increasing availability of cheap memory, which is then immediately filled with buffered data. The metaphor is grocery store checkout lines: a cramped system where one individual tasks can block many other tasks waiting in line. But you can avoid the worst problems by having someone actively managing the checkout queues, and this is the solution for bufferbloat as well: AQM (Active Queue Management). However, AQM (and the metaphor) break down in the modern age when Queues are long and implementation is not quite so straightforward.

Kathleen Nichols at Pollere and Van Jacobson at Parc have a new solution that they call CoDel (Controlled Delay), which has several features that distinguish it from other AQM systems.

"A modern AQM is just one piece of the solution to bufferbloat. Concatenated queues are common in packet communications with the bottleneck queue often invisible to users and many network engineers. A full solution has to include raising awareness so that the relevant vendors are both empowered and given incentive to market devices with buffer management.""

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