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.  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 majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to