Pocket loss on 82545EM Gigabit Ethernet Controller (Copper)

Hello,
I have a VM with network card: 82545EM Gigabit Ethernet Controller (Copper)
- SpanSwitch
when I use libpcap of dpdk I see 30% packet loss. Only when I bind the
network card to igb_uio I do not see packet loss anymore. Without dpdk I
there is no packet loss also.

Is there a problem running libpcap on this network card?
Thanks, Keren