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The past few years have witnessed a lot of debate on how large Internet router buffers should be. The widely believed rule-of-thumb used by router manufacturers today mandates a buffer size equal to the delay-bandwidth product. This rule was first challenged by researchers in 2004 who argued that if there are a large number of long-lived TCP connections owing through a router, then the buffer size needed is equal to the delay-bandwidth product divided by the square root of the number of long-lived TCP flows.
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