Proposed patch, convert IFQ_MAXLEN to kernel tunable...

[Bruce M. Simpson]

gnn at FreeBSD.org wrote:
> ...
> I found no occurrences of the above in our code base.  I used cscope
> to search all of src/sys.  Are you aware of any occurrences of this?
>   

I have been using IFQ_MAXLEN to size buffer queues internal to some 
IGMPv3 stuff.

I don't feel comfortable with a change which sizes the queues for both 
IPv4 and IPv6 stacks, from a variable which is obscured by a macro.

thanks
BMS