Hi Joe,

> I wonder if we can use the average VPP vector rate (size) per node to
> estimate the load of a VPP instance.
> More specifically, if this information can be used to determine whether
> the VPP instance is overloaded (e.g., > the default max value of 255).

Yes, it is the main way to quickly assess VPP load, see 
https://fd.io/docs/vpp/master/troubleshooting/cpuusage.html#vpp-cpu-load
My very crude rule-of-thumb looks like this (but your mileage may vary):
 - between 0 and 50: VPP is not working too hard
 - between 50 and 100: VPP is starting to be pushed hard
 - above 100: you'll probably experiment drops with bursts
 - 250+: you're dropping traffic

Best
ben
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