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The issue of router buffer sizing is an important research problem and is still open though researchers have debated this for many years. The research method can be classified into two kinds: one is based on queuing theory, the other uses TCP as model. From the point of TCP model, many researchers concluded that buffer size can be significantly reduced. It's desirable that the buffers are so small that fast memory technology and all-optical buffering can be used. But queuing model with self-similar incoming traffic suggested that extremely large buffers are needed to achieve acceptable packet loss rate.
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