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by ncmncm
2249 days ago
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Small correction: for good congestion control you don't need RTT, you really need the transmission time. RTT is easier to get, but very noisy, and late. By the time you get it, it's obsolete. The way to get good clean flow control is to measure forward transmission time, and have the receiver keep a predictor on the sender updated. Increments in the forward transmission time signal changes in aggregate queue length. Your measurement updates are always about the past, so you need to apply control theory to use them correctly. |
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