linux-kernel - Re: [PATCH] DMA: Freescale: change BWC from 256 bytes to 1024 bytes

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Date:	Mon, 20 Jan 2014 13:13:49 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	hongbo.zhang@...escale.com
Cc:	dan.j.williams@...el.com, dmaengine@...r.kernel.org,
	scottwood@...escale.com, LeoLi@...escale.com,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] DMA: Freescale: change BWC from 256 bytes to 1024 bytes

On Thu, Jan 16, 2014 at 02:10:53PM +0800, hongbo.zhang@...escale.com wrote:
> From: Hongbo Zhang <hongbo.zhang@...escale.com>
> 
> Freescale DMA has a feature of BandWidth Control (ab. BWC), which is currently
> 256 bytes and should be changed to 1024 bytes for best DMA throughput.
> Changing BWC from 256 to 1024 will improve DMA performance much, in cases
> whatever one channel is running or multi channels are running simultanously,
> large or small buffers are copied.  And this change doesn't impact memory
> access performance remarkably, lmbench tests show that for some cases the
> memory performance are decreased very slightly, while the others are even
> better.
> Tested on T4240.

Applied, thanks

--
~Vinod
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