On Mon, May 18, 2015 at 7:59 AM, Tony Lindgren <tony@xxxxxxxxxxx> 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. Using "hdparm -t --DIRECT /dev/sda" with a USB hard drive attached via the USB EHCI port, I see a read speed of ~24MB/s (vs ~33MB/s on my laptop). I see the same behaviour on a recent kernel (from tony/omap-for-v4.2/cleanup, otherwise works nicely on an Overo FWIW) with and without the dmaengine patch. What would be the expected USB read speed for an OMAP3 platform? --Ash [1] http://gumstix.8.x6.nabble.com/Low-USB-speed-on-Overo-td4969907.html -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
