On 11/05/2013 05:39 PM, Cliff Brake wrote:
On Tue, Nov 5, 2013 at 9:57 AM, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
You might be better off writing a special-purpose userspace driver,
using libusb, instead of relying on the HID driver. That would allow
you to handle your data more efficiently, and with interrupts enabled.
We tried this early on, but ran into other performance problems.
Thanks for the idea, we may re-visit this.
When you say "performance problems" and libusb... how many active
transfers did you keep submitted at one time in your libusb application?
Greg recently said on this list:
You should be able to hit USB "line speed" from userspace
if you just are reading/writing bulk data with enough transferrs in
flight.
Alan.
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