safsfas lot of hardware is not able to sustain line rate. For instance,
　　ixgbe has problems with receiving frames that are not multiple
　　of 64 bytes (with/without CRC depending on the driver); also on
　　transmissions, ixgbe tops at about 12.5 Mpps unless the driver
　　prefetches tx descr iptors. igb does line rate in all configurations.
　　e1000/e1000e vary between 1.15 and 1.32 Mpps. re/r8169 is
　　extremely slow in sending (max 4-500 Kpps)