The following reply was made to PR kern/34164; it has been noted by GNATS.

From: Frank Kardel <kardel@netbsd.org>
To: gnats-bugs@netbsd.org
Cc: kern-bug-people@netbsd.org, gnats-admin@netbsd.org,
	netbsd-bugs@netbsd.org
Subject: Re: kern/34164: unconnected ippp? interfaces hang onto pakets to
 be send
Date: Tue, 08 Aug 2006 20:18:13 +0200

 Pavel Cahyna wrote:
 
 > >  Does it make sense to queue so many pakets(mbufs)?
 > 
 > isn't it because of
 > 
 > $ sysctl net.inet.ip.ifq.maxlen
 > net.inet.ip.ifq.maxlen = 256
 > 
 >  
 >
 good observation.
 So I got 4 interfaces being capable of keep ifq.maxlen
 mbufs when not connected. How does this relate to
 the maximum number of mbufs? In that scenario it was
 very easy to run out of mbufs.
 Is 256 too high ? Should the maximum number of mbufs
 be scaled with the number of interfaces. Or should
 we just ignore this and I set ifq.maxlen to 32 on my system
 and be done with?
 
 Frank