[libvirt] Where does 'rx_drop' in 'domifstat' come from?

[Yaniv Kaul]

Any idea why I'd see drops on an interface?
mini at ykaul-mini:~/ovirt-system-tests$ sudo virsh domifstat 111 vnet1
vnet1 rx_bytes 25488
vnet1 rx_packets 387
vnet1 rx_errs 0
*vnet1 rx_drop 1424*
vnet1 tx_bytes 5751
vnet1 tx_packets 39
vnet1 tx_errs 0
vnet1 tx_drop 0

I have several others VMs in the same host, pretty much identically
configured, all are fine, all on the same bridge:
mini at ykaul-mini:~/ovirt-system-tests$ sudo brctl show
bridge name bridge id STP enabled interfaces
5e85-930e31b 8000.525400247745 yes 5e85-93031b-nic
vnet0
vnet1
vnet2
vnet3
vnet4
virbr0 8000.5254005e7e4b yes virbr0-nic

Network (host0 is the problematic one):
virsh # net-dumpxml 5e85-930e31b9b9
<network connections='5'>
  <name>5e85-930e31b9b9</name>
  <uuid>6f52f5a8-5322-4b57-890e-d4d5a0a7ed50</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='5e85-930e31b' stp='on' delay='0'/>
  <mac address='52:54:00:24:77:45'/>
  <dns forwardPlainNames='yes'/>
  <ip address='192.168.200.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.200.100' end='192.168.200.254'/>
      <host mac='54:52:c0:a8:c8:04' name='lago_basic_suite_3_6_host1'
ip='192.168.200.4'/>
      <host mac='54:52:c0:a8:c8:03' name='lago_basic_suite_3_6_engine'
ip='192.168.200.3'/>
      <host mac='54:52:c0:a8:c8:02'
name='lago_basic_suite_3_6_storage-iscsi' ip='192.168.200.2'/>
      <host mac='54:52:c0:a8:c8:05' name='lago_basic_suite_3_6_storage-nfs'
ip='192.168.200.5'/>
      <host mac='54:52:c0:a8:c8:06' name='lago_basic_suite_3_6_host0'
ip='192.168.200.6'/>
    </dhcp>
  </ip>
</network>


Domain XML attached.
Running libvirt 1.2.18, on latest F23.

TIA,
Y.
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