The overrun value in the RX line of ifconfig output is high

Issue

• In some interface the overrun values in RX line is high but there are no drops
• What is causing the overruns?
• Will these overruns cause low performance?
• NIC overruns % appears too high . One of the NICs in a bonded interface is running a high percentage of overruns when compared to the other NIC.
• Is this an issue in waiting and/or how to track the cause of the overruns ?

# ifconfig bond1
bond1     Link encap:Ethernet  HWaddr 00:17:A4:XX:XX:XX
          inet addr:192.168.X.Y Bcast:192.168.11.255  Mask:255.255.255.0
          inet6 addr: fe80::217:a4ff:fe77:XXXX/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:2695936306 errors:4839818 dropped:0 overruns:4839818 frame:0
          TX packets:2649162472 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1713169067539 (1.5 TiB)  TX bytes:1570631367176 (1.4 TiB)