Thanks for the fast reply!
Some additional info:
1. I think it is an "Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network Connection". (Not 82599EB as I wrote in my first post)
2. I'm using Ubuntu 14.4.
3. I'm reading the statistic registers on the NIC. The register for Good Packets Received Count, GPRC, (at 0x04074) gives the total amount of received packets at the interface. This number is the same as the amount of packets that I'm sending, so it looks like it's correct! I'm then dividing these packets into different queues using Flow Director filters and I'm then reading the registers for Queue Packets Received Count, QPRC, (at 0x01030 + 0x40*n, n=0...15) and Queue Packets Received Drop Count, QPRDC, (at 0x01430 + 0x40*n, n=0...15) to see how many packets that have been put in each queue.
All packets should be put in a queue, right? The problem is that the amount of packets received at the queues (i.e. by summing all QPRC and QPRDC registers) are less than the amount of packets received at the interface in total (i.e. according to the GPRC register)! Shouldn't these numbers be the same? Or are packets lost somewhere after being received at the NIC, without this being registered in a statistic register (for example, without being registered at the QPRDC registers)?
Johan