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Date:      Thu, 12 Dec 2002 11:23:10 -0800
From:      Kris Kennaway <kris@obsecurity.org>
To:        Garrett Wollman <wollman@lcs.mit.edu>
Cc:        Nate Lawson <nate@root.org>, current@FreeBSD.ORG
Subject:   Re: if_fxp and pause packets (or, "I didn't need the network anyway")
Message-ID:  <20021212192310.GA8113@rot13.obsecurity.org>
In-Reply-To: <200212121704.gBCH4DiF010233@khavrinen.lcs.mit.edu>
References:  <Pine.NEB.3.96L.1021211215617.2056C-100000@fledge.watson.org> <Pine.BSF.4.21.0212112308070.32698-100000@root.org> <200212121704.gBCH4DiF010233@khavrinen.lcs.mit.edu>

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On Thu, Dec 12, 2002 at 12:04:13PM -0500, Garrett Wollman wrote:
> <<On Wed, 11 Dec 2002 23:09:46 -0800 (PST), Nate Lawson <nate@root.org> s=
aid:
>=20
> > I've noticed this too with fxp.  It only happens while in ddb and I
> > thought it was my fault (I was debugging some networking problems).
>=20
> It happens when the NIC's receive queue fills up.  When you're in DDB,
> the kernel is not answering network interrupts.

One of my machines has an fxp that likes to do this while the machine
is still up -- perhaps it's just a manifestation of 5.0's higher
interrupt latency.

Kris

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