Hi, Wenzhuo, Regarding MDD for I40E, I am basing this on what I saw on the web regarding MDD on I40E: https://lists.osuosl.org/pipermail/intel-wired-lan/Week-of-Mon-20170925/010131.html https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1772675 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1723127 and more. Regards, Rami Rosen