linux-kernel - Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at lib/dma-debug.c:902 check

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Message-ID: <20100123232133.GA3487@del.dom.local>
Date:	Sun, 24 Jan 2010 00:21:33 +0100
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Michael Breuer <mbreuer@...jas.com>
Cc:	David Miller <davem@...emloft.net>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	akpm@...ux-foundation.org, flyboy@...il.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Michael Chan <mchan@...adcom.com>,
	Don Fry <pcnet32@...izon.net>,
	Francois Romieu <romieu@...zoreil.com>,
	Matt Carlson <mcarlson@...adcom.com>
Subject: Re: Hang: 2.6.32.4 sky2/DMAR (was [PATCH] sky2: Fix WARNING: at
 lib/dma-debug.c:902 check_sync)

On Fri, Jan 22, 2010 at 06:50:21PM -0500, Michael Breuer wrote:
> When the packets were dropped, there was a different sequence in the
> log - DISCOVER/OFFER repeated. The "normal" is that the sequence
> appeared correct and complete - DISCOVER/OFFER/REQUEST/ACK - or
> INFORM/ACK (vs. INFORM repeatedly sans ACK) as the case may be.

Anyway, I'd be intersted if the switch matters here.

Plus one more test: could you try to load sky2 with the parameter:
"copybreak=1" (the rest as in any recent test, which gave you dmar
errors; any switch).

Thanks,
Jarek P.
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