He described saturation as how much the processes want to use the resource beyond the maximum 100% utilization. E.g. if you look at load average on Linux, that's the size of the run queue (processes that are ready to run + blocking on uninterruptable IO) versus just CPU usage which cannot go over the 100%. That requires there is a meaningful queue. There's lots more in his excellent "Systems Performance" book.
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He described saturation as how much the processes want to use the resource beyond the maximum 100% utilization. E.g. if you look at load average on Linux, that's the size of the run queue (processes that are ready to run + blocking on uninterruptable IO) versus just CPU usage which cannot go over the 100%. That requires there is a meaningful queue. There's lots more in his excellent "Systems Performance" book.