I want to ask about PerfectSwitch. PerfectSwitch is a router or arbiter?

http://www.m5sim.org/Simple

And Why PerfectSwitch need to have routing table?

I know PerfectSwitch has Round Robin scheduling to choose a virtual network
perform and the switch will see the message destination.

But Why it needs to have a priority number and reverse the priority number?
Is avoid starvation? But Round Robin will have starvation condition?

Why they need a switch to control? (Is it order to a better shortest
destination?)

Best regards,

Jimmy
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