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Date:      Wed, 13 Aug 2008 23:22:39 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Mike Tancsa <mike@sentex.net>
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
Message-ID:  <alpine.BSF.1.10.0808132318090.41778@fledge.watson.org>
In-Reply-To: <200808132135.m7DLZTeK039233@lava.sentex.ca>
References:  <alpine.BSF.1.10.0808031142550.65130@fledge.watson.org> <alpine.BSF.1.10.0808082219360.16028@fledge.watson.org> <200808120059.m7C0xvUH028011@lava.sentex.ca> <alpine.BSF.1.10.0808121119040.86332@fledge.watson.org> <200808132034.m7DKY7wm038972@lava.sentex.ca> <alpine.BSF.1.10.0808132138170.41778@fledge.watson.org> <7.1.0.9.0.20080813164157.161ba2e8@sentex.net> <200808132116.m7DLGY1f039165@lava.sentex.ca> <20080813212544.GA25915@eos.sc1.parodius.com> <200808132135.m7DLZTeK039233@lava.sentex.ca>

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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



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