About netstat -m: What is "mbuf+clusters out of packet secondary zone in use" ?

[Yony Yossef]

> > Hi All,
> >
> > I'm testing an Ethernet driver on FreeBSD 6.3.
> >
> > Running netstat -m during an ethernt stress test I see that the 
> > "mbuf+clusters out of packet secondary zone in use" number 
> is growing 
> > gradualy.
> > Problem is it never goes down after I stop the test, so 
> it's pushing 
> > the "mbufs in use" up until the following stress test 
> iterations reach 
> > the OS limit.
> > What does this number mean?
> >
> >
> > 506391/126009/632400 mbufs in use (current/cache/total)
> > 141035/121109/262144/262144 mbuf clusters in use 
> > (current/cache/total/max) 131054/610 mbuf+clusters out of packet 
> > secondary zone in use (current/cache)
> >
> 
> Can you say what the ethernet stress test do you use?
> 

I'm using a bi-directional test running multiple processes of this ping
command:

/sbin/ping -c 5000 -i 0.0001 -s 65507 -l 100 <ip>