Subject: Re: NetBSD in BSD Router / Firewall Testing
To: Mike Tancsa <firstname.lastname@example.org>
From: Steven M. Bellovin <email@example.com>
Date: 12/01/2006 11:25:31
On Fri, 01 Dec 2006 10:00:09 -0500
Mike Tancsa <firstname.lastname@example.org> wrote:
> At 09:55 AM 12/1/2006, Steven M. Bellovin wrote:
> > > ipintrq:
> > > queue length: 0
> > > maximum queue length: 256
> > > packets dropped: 133721212
> >This is the second report we've seen recently of packet drops in this
> >queue. We need to understand what's going on, I think.
> I am guessing I am just overwhelming the box no ? Each of my
> generator boxes are blasting about 600Kpps in opposite directions
> through the box 10 byte UDP packets. Even when doing just the one
> stream in NetBSD, the box (r2) acting as the router is totally
> unresponsive from the serial console and OOB NIC.
I'd have expected the problem to show as drops on the output queue, not
ipintrq, unless you're running at near-100% CPU. The previous case did
not involve CPU exhaustion -- does yours?
--Steve Bellovin, http://www.cs.columbia.edu/~smb