Hi, I'm looking for a way to test our netback/netfront drivers with various buffer layouts, and I'm interested to see whether packetdrill can be used for that purpose. These drivers are used in Xen based systems to facilitate network communication between guests and the control domain. Technically speaking, I want to inject skbs at one end (i.e. call the device's start_xmit with my skb), and see what turned up on the other end. The most important things I want to tinker with are the sizes of the linear buffer and the frags, frag_lists and so on. Do you think there is a way to make packetdrill to do that for me somehow? As far as I see it works on a much higher level, and lives in the userspace, so I guess it would be a bit hard to specify the exact buffer layouts from there. Regards, Zoltan Kiss