From owner-freebsd-net@FreeBSD.ORG  Sat Apr 26 09:02:53 2008
Return-Path: <owner-freebsd-net@FreeBSD.ORG>
Delivered-To: net@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A4342106564A;
	Sat, 26 Apr 2008 09:02:53 +0000 (UTC)
	(envelope-from luigi@onelab2.iet.unipi.it)
Received: from onelab2.iet.unipi.it (onelab2.iet.unipi.it [131.114.9.129])
	by mx1.freebsd.org (Postfix) with ESMTP id 6D3A48FC1A;
	Sat, 26 Apr 2008 09:02:53 +0000 (UTC)
	(envelope-from luigi@onelab2.iet.unipi.it)
Received: by onelab2.iet.unipi.it (Postfix, from userid 275)
	id 3C04F7318D; Sat, 26 Apr 2008 11:05:12 +0200 (CEST)
Date: Sat, 26 Apr 2008 11:05:12 +0200
From: Luigi Rizzo <rizzo@iet.unipi.it>
To: net@freebsd.org, current@freebsd.org
Message-ID: <20080426090512.GB74094@onelab2.iet.unipi.it>
References: <20080425160039.GA65918@onelab2.iet.unipi.it>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20080425160039.GA65918@onelab2.iet.unipi.it>
User-Agent: Mutt/1.4.2.3i
Cc: 
Subject: Re: 'nfe' stalls (analysis and partial solution)
X-BeenThere: freebsd-net@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Networking and TCP/IP with FreeBSD <freebsd-net.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-net>
List-Post: <mailto:freebsd-net@freebsd.org>
List-Help: <mailto:freebsd-net-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-net>,
	<mailto:freebsd-net-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sat, 26 Apr 2008 09:02:53 -0000

On Fri, Apr 25, 2008 at 06:00:39PM +0200, Luigi Rizzo wrote:
> just for the record and the mail archives - i have been experiencing
> a lot of unrecovered stalls of the network card with the 'nfe'
> driver under heavy load (this was on 7.0-i386 and 7.0-amd64, but
> it is hardware related so it cross-platform).
> 
> After 2-3 days of investigation, and with the help of
> Pyun YongHyeon (yongari) i finally managed to pin down the
> problem and start working on a solution.
> 
> I would be grateful if others can report of similar problems
> with the 'nfe' driver so we can see if the patch we can come
> up with also fix their problem.

followup:

a patch to address the problem is available at

	http://info.iet.unipi.it/~luigi/FreeBSD/

(current version is
http://info.iet.unipi.it/~luigi/FreeBSD/nfe-20080426.1044.diff
but it might change with time as we get more details or info
on how to deal with this problem).

	cheers
	luigi