linux-kernel - Re: [PATCH 21/21]: powerpc/cell spidernet DMA coalescing

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Date:	Wed, 11 Oct 2006 17:15:10 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	jschopp <jschopp@...tin.ibm.com>
Cc:	Linas Vepstas <linas@...tin.ibm.com>, akpm@...l.org,
	jeff@...zik.org, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, James K Lewis <jklewis@...ibm.com>,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH 21/21]: powerpc/cell spidernet DMA coalescing

On Tue, 2006-10-10 at 18:20 -0500, jschopp wrote:
> Linas Vepstas wrote:
> > The current driver code performs 512 DMA mappns 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.
> > 
> > Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
> > Cc: James K Lewis <jklewis@...ibm.com>
> > Cc: Arnd Bergmann <arnd@...db.de>
> 
> The others look good, but this one complicates the code and doesn't have any benefit.  20 
> for 21 isn't bad.

Hi Joel !

I'm not sure what you mean here.... (especially your 20 to 21 comment).

The patch looks perfectly fine to me, and in fact removes more lines of
code than it adds :)

Cheers,
Ben.


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