Measuring latency between USB packets in kernel to user space

Hi all,

I was wondering if anyone has measured the latency between the GNU Radio
USB packets from kernel to user space.

A UCLA paper eluded to it being around 200us on their system, noting
that it was the minimum latency they measured to get the data from user
space to the USB driver for all sampling rates. It’s not an exact
measurement, but rather an upper bound.

If not, I’ll try tossing some timestamps on the data and compare the
two.

  • George