netdev - Re: [PATCH 1/16] Spidernet DMA coalescing

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Message-ID: <20061213172714.GQ4329@austin.ibm.com>
Date:	Wed, 13 Dec 2006 11:27:14 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Andrew Morton <akpm@...l.org>, jgarzik@...ox.com,
	netdev@...r.kernel.org, linuxppc-dev@...abs.org,
	James K Lewis <jklewis@...ibm.com>,
	Arnd Bergmann <arnd@...db.de>,
	Geoff Levand <geoffrey.levand@...sony.com>
Subject: Re: [PATCH 1/16] Spidernet DMA coalescing

On Thu, Dec 07, 2006 at 10:11:51AM +0000, Christoph Hellwig wrote:
> On Wed, Dec 06, 2006 at 05:27:45PM -0600, Linas Vepstas wrote:
> > 
> > The current driver code performs 512 DMA mappings of a bunch of 
> > 32-byte structures. This is silly, as they are all in contiguous 
> > memory. Ths patch changes the code to DMA map the entie area
> > with just one call.
> 
> This is still wrong.  The descriptor array must be in dma_alloc_coherent
> memory, not a streaming mapping.  (I also think I pointed this out a while
> ago when I made dma_alloc_coherent node-aware)

Sorry, I missed this the first time. I'm splitting this off now; will 
resubmit shortly.

--linas
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