Re: High CPU usage when video streaming on EHCI, 3.17.8 kernel with DMA enabled

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* Matthieu CASTET <matthieu.castet@xxxxxxxxxx> [150518 01:34]:
> Hi,
> 
> last time I checked uvc driver, it was doing memcpy of video buffer : see uvc_video_decode_data.
> 
> It your video resolution is big, this can eat lot's of cpu.
> 
> Doing a trace should help you.

For the memcpy part with DMA this patch should help too:

[PATCH] dmaengine: omap-dma: Add support for memcpy

Regards,

Tony
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