linux-kernel - Re: [linux-sunxi] Re: [PATCH] dma: sun4i: expose block size and wait cycle configuration to DMA users

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Date:	Wed, 9 Mar 2016 11:08:53 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Chen-Yu Tsai <wens@...e.org>, linux-sunxi@...glegroups.com,
	Emilio López <emilio@...pez.com.ar>,
	linux-arm-kernel@...ts.infradead.org,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [linux-sunxi] Re: [PATCH] dma: sun4i: expose block size and wait
 cycle configuration to DMA users

> > 
> > It doesn't really makes sense to us, but it does have a significant
> > impact on the throughput.
> 
> I wouldn't say significant impact, but tweaking those parameters has
> some impact on the performances, and since it's not that complicated to
> implement, I thought it was worth a try, but maybe I'm wrong.
> 

Hello

I am working on adding DMA on the crypto driver sun4i-ss and I confirm that tweaking those parameter can increase speed.

Regards

LABBE Corentin