Dropped Packets - Different NICs

Hi,
We have some HPE DL580 G9 and RHEL 6.5 is installed on those servers.
We are facing with dropped packets on our servers and actually on one of 10Gb NICs.
There is two type of NICs are installed on the servers:
Intel Corporation 82599ES 10-Gigabit SFI/SFP+ (PCI)
Broadcom Corporation NetXtreme II BCM57810 10 Gigabit Ethernet (FLR)

The Broadcom NIC works fine without packet drop but Intel NIC is dropping packets. All configurations are same and the NICs are connected to same switch and Jumbo Frame is enabled on both.
Buffer size is increased to hardware maximum on both RX and TX.

There is some questions about this situation:
1. How can we monitor dropping packets via TCPDUMP or WireShark?
2. There is no lot of dropped packets and there is no CRC error, so has it impact on Oracle RAC performance or other clustering solutions?
3. Is there any other recommendation about this situation?