If you are looking to get awesome performance with our standard Linux kernel drivers without Solarflare's OpenLoad, see his blog. Matthew writes: "The biggest change from our G3 to G4 servers was the jump from 1Gbps to 10Gbps network interfaces. With our G3 servers, we would sometimes max out the 6Gbps of network capacity per server when under certain high-volume Layer 7 attacks. We knew we wanted to jump to 10Gbps on each server, but we also wanted to pick the right network controller card. We ended up testing a very wide range of network cards, spending more time optimizing this component in the servers than any other. In the end, we settled on the network cards from a company called Solarflare. (It didn't hurt that their name was similar to ours.)"
See the complete story at http://blog.cloudflare.com/a-tour-inside-cloudflares-latest-generation-serversGuest Blog by Bruce Tolley, VP Solutions Marketing at Solarflare