linux-kernel - Re: [PATCH v6 2/2] mmc: jz4740: prepare next dma transfer in parallel with current transfer

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Date:	Tue, 12 Aug 2014 22:02:28 +0200
From:	Apelete Seketeli <apelete@...eteli.net>
To:	Chris Ball <chris@...ntf.net>
Cc:	Ulf Hansson <ulf.hansson@...aro.org>,
	H Hartley Sweeten <hsweeten@...ionengravers.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Alex Smith <alex.smith@...tec.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/2] mmc: jz4740: prepare next dma transfer in
 parallel with current transfer

Hi Chris,

On Tue, Aug-12-2014 at 07:12:33 PM +0100, Chris Ball wrote:
> Hi Apelete,
> 
> On Mon, Jul 21 2014, Apelete Seketeli wrote:
> > It should help reduce the impact of DMA preparation overhead on the SD
> > card performance.
> 
> Did you do any benchmarking to check that this is true?  (If so, it'd
> be good to note what performance change you saw in the commit message.)

I actually did a few quick benchmarks, posted the results in the cover
letter: https://lkml.org/lkml/2014/7/21/11.
As you can see the improvement is measurable, although not significant
with zcat.

Cheers.
-- 
        Apelete
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