netdev - Re: [PATCH 02/11] sky2: fix DMA sync

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Message-Id: <20100120.161534.173867444.davem@davemloft.net>
Date:	Wed, 20 Jan 2010 16:15:34 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	jarkao2@...il.com, netdev@...r.kernel.org
Subject: Re: [PATCH 02/11] sky2: fix DMA sync_single length error

From: Stephen Hemminger <shemminger@...tta.com>
Date: Wed, 20 Jan 2010 16:04:07 -0800

> The usage of jumbo frames on the Marvell Yukon-2 chip version that
> Michael has is suspect. In order to do Jumbo frames, the driver has
> turns off the store-forward buffer; this reduces the window for transmit
> underrun, and triggers a problem.  I suspect the unwind logic for
> transmit underrun is broken and may not be fixable without more hardware
> information.  Turning off jumbo frame support for that chip type
> is probably the safest solution.

So let's do that.

Meanwhile I think the DMA debugging patch you posted earlier today
need a little work, will reply there.

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