So TCP tries to find this value: it starts out slow, and increases until it detects a drop - a packet that didn't make it, which is assumes is because there aren't enough slots. When that happens it reduces (often by a lot) the size of the window. It sort of "homes in".
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But if you see the network as train-cars or sushi on a belt, what you can see is that what we *really* want is to fill as many slots as we can when we're sending data! That's really all that's going on.
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One problem with the metaphor: packets don't actually go in loops, they come at the other end, so unlike a sushi belt, there's a kind of off-ramp at each end. Also packets only enter and exit at the ends. There's really no perfect metaphor.
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I'm going to meditate on better metaphors, so that's it for now :)
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End of conversation
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