Your input queue drops are caused by spd flushes. Search for "Selective Packet Discard" - I think the command you want is
ip spd queue max
My experience has been that the 6500s have the charming property of NOT automatically changing the SPD threshold. So no matter what your input q size is it still acts like it's set to the default 75.. the only difference is you get input q flushes instead of drops.
For whatever it's worth, everything I've read indicates that packets are put on the input queue only when the MSFC has to process them - so you need to be looking for pkts punted to the MSFC, broadcasts & pkts addressed to the router. An excessive number of ARP requests could do it. Unless you're doing something horrid like pointing a static route at an ethernet interface I kind of doubt a virus would be giving your router heartburn..
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
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looking for early feedback from customers befor...
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