On Fri, Oct 26, 2018 at 06:27:38PM +0200, Miroslav Lichvar wrote:

The other patches add support for the new ioctl to the e1000e, igb,
and ixgbe driver. Tests with few different NICs in different machines
(and PCIe slots) show that:
- with an I219 (e1000e) the measured delay improved from 2500 to 1300 ns
  and the error in the measured offset, when compared to cross
  timestamping, was reduced by a factor of 5
- with an I210 (igb) the delay improved from 5100 to 1700 ns
- with an I350 (igb) the delay improved from 2300 to 750 ns
- with an X550 (ixgbe) the delay improved from 1950 to 650 ns

Nice work!  This is a welcome improvement.

Thanks,
Richard