USB transfers in device drivers

[Hans Petter Selasky]

On 2019-05-02 11:18, O'Connor, Daniel wrote:
> OK, thanks.
> To be honest I would much prefer to work out why this particular hardware & software seem to drop the ball for such a long time - 50msec without the kernel getting to schedule something (on a basically idle system) is quite perplexing to me.

Sounds like a lost IRQ issue. Did you try any of the EHCI quirks in 
hw.usb.ehci ?

--HPS