Hi János, We actually saw the reverse behavior on our end. Does dmesg complains about your card not being on a PCI Express 3 x8 port? To achieve full 40G it is a requirement (assuming you have a 4X10G setup).
Tom ----- Mail original ----- > De: "János Pauer" <[email protected]> > À: [email protected] > Envoyé: Mardi 16 Janvier 2018 16:01:31 > Objet: [dpdk-users] performance difference between ixgbe and i40e > Hi all, > > I am using OVS with dpdk v16.11. I have two setups for performance > measurement, > which are almost identical, the only difference is that one setup has i40e > driven 10G NICs and the other one has ixgbe driven 10G NICs. > I have MoonGen for packet generating, and testPMD to reflect the traffic. The > measurement results are much higher with the ixgbe-driven card. It's about > +20% > with smaller packet sizes, and more than +40% with bigger packet sizes. > Does anyone have any idea what can cause this? Is there any significant > difference between the mentioned drivers? > > Thanks and Regards, > János
