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

From: Vinod Koul
Date: Mon Jan 20 2014 - 03:45:34 EST

On Thu, Jan 16, 2014 at 02:10:53PM +0800, hongbo.zhang@xxxxxxxxxxxxx wrote:
> From: Hongbo Zhang <hongbo.zhang@xxxxxxxxxxxxx>
> 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

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