>   There's probably a tightloop of frees going on somewhere.  It's tough
>   for me to analyze this as I cannot reproduce it.  Have you tried
>   running your tests over loopback to see if the same thing happens?

What is the definition of "tightloop"? The received packet mbufs are freed
when the packets get processed/discarded which happens once for
a packet. The received packet rate is 50000-150000 packets per second.
> 
>   If so, and it does, can you please explain how to exactly replicate
>   the test?

Mirror a port with ~300-800Mbps of IP traffic to an em port. Just enable
promisc and monitor so it drops the packets after interrupt processing.
The overhead beyond that is neglible compared to mb_free.

Pete


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