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

2015-07-02 Thread Tony Lindgren
* Tom Mises tommi...@gmail.com [150701 11:24]: On Mon, May 18, 2015 at 8:59 AM, Tony Lindgren t...@atomide.com wrote: For the memcpy part with DMA this patch should help too: [PATCH] dmaengine: omap-dma: Add support for memcpy The patch should help, but not out of the box as far as I

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

2015-07-01 Thread Tom Mises
I has been some time, but I have an update to share. On Sun, May 17, 2015 at 8:06 AM, Alan Stern st...@rowland.harvard.edu wrote: You might be able to learn more from ftrace. See the instructions in Documentation/trace/ftrace.txt. The irqsoff tracer may be the best one to try. I used ftrace

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

2015-05-21 Thread Ash Charles
On Mon, May 18, 2015 at 7:59 AM, Tony Lindgren t...@atomide.com wrote: [PATCH] dmaengine: omap-dma: Add support for memcpy Hi Tom, To follow up on your corresponding mail to the gumstix list [1], I tried on the 3.17.8 kernel on an Overo COM (DM37390) with the suggested dmaengine patch applied.