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From: Robert Watson <rwatson@FreeBSD.org>
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To: Mike Tancsa <mike@sentex.net>
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Cc: Jeremy Chadwick <koitsu@FreeBSD.org>, stable@FreeBSD.org,
	Jack Vogel <jfvogel@gmail.com>
Subject: Re: HEADS UP: inpcb/inpcbinfo rwlocking: coming to a 7-STABLE branch
 near you
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On Wed, 13 Aug 2008, Mike Tancsa wrote:

> At 05:25 PM 8/13/2008, Jeremy Chadwick wrote:
>> >
>> > I will try a kernel before the em changes, as thats the only other thing
>> > I can think of off the top of my head.
>
> I commented out em from the kernel and loaded up a previous version via kld, 
> but still the same thing, although not nearly as much
....
> No, its very, very quiet.  All the other machines on the 2 networks are just 
> fine.
>
> Any suggestions on what kernel to go back to start from ?

I'm concerned by the presence of multiple ARP entries for a single IP -- I'll 
need to reread the ARP code to refresh my memory, but in general I would 
expect to see at most one in-progress or complete ARP entry for any particular 
IP address at a time.  To me, this suggests a bug -- perhaps a race condition 
or just a general logic bug.  If rolling back fixes it, that is definitely 
interesting, but we can also debug this in the normal ways and see where it 
leads us.

Robert N M Watson
Computer Laboratory
University of Cambridge