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



Any idea why I'd see drops on an interface? 
mini 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 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.
<domain type='kvm' id='111'>
  <name>5e8574ee-lago_basic_suite_3_6_host0</name>
  <uuid>d3d2ccca-3615-42f7-a409-198879e95ee1</uuid>
  <memory unit='KiB'>8387584</memory>
  <currentMemory unit='KiB'>8387584</currentMemory>
  <vcpu placement='static'>2</vcpu>
  <resource>
    <partition>/machine</partition>
  </resource>
  <os>
    <type arch='x86_64' machine='pc-i440fx-2.4'>hvm</type>
    <bootmenu enable='yes'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <pae/>
  </features>
  <cpu mode='host-passthrough'>
    <topology sockets='2' cores='1' threads='1'/>
  </cpu>
  <clock offset='utc'>
    <timer name='kvmclock'/>
    <timer name='hpet'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>destroy</on_crash>
  <devices>
    <emulator>/usr/bin/qemu-kvm</emulator>
    <disk type='file' device='disk'>
      <driver name='qemu' type='qcow2'/>
      <source file='/home/zram/3.6/default/images/lago_basic_suite_3_6_host0_root.1458136856'/>
      <backingStore type='file' index='1'>
        <format type='raw'/>
        <source file='/home/zram/3.6/default/images/lago_basic_suite_3_6_host0_root.qcow2'/>
        <backingStore/>
      </backingStore>
      <target dev='vda' bus='virtio'/>
      <boot order='1'/>
      <alias name='virtio-disk0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </disk>
    <controller type='usb' index='0'>
      <alias name='usb'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'>
      <alias name='pci.0'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <alias name='virtio-serial0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </controller>
    <interface type='network'>
      <mac address='54:52:c0:a8:c8:06'/>
      <source network='5e85-930e31b9b9' bridge='5e85-930e31b'/>
      <target dev='vnet1'/>
      <model type='virtio'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </interface>
    <serial type='pty'>
      <source path='/dev/pts/2'/>
      <target port='0'/>
      <alias name='serial0'/>
    </serial>
    <console type='pty' tty='/dev/pts/2'>
      <source path='/dev/pts/2'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>
    </console>
    <channel type='unix'>
      <source mode='bind' path='/var/lib/libvirt/qemu/channel/target/5e8574ee-lago_basic_suite_3_6_host0.org.qemu.guest_agent.0'/>
      <target type='virtio' name='org.qemu.guest_agent.0' state='connected'/>
      <alias name='channel0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <graphics type='vnc' port='5901' autoport='yes' listen='0.0.0.0' keymap='en-us'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='cirrus' vram='16384' heads='1'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </video>
    <memballoon model='none'>
      <alias name='balloon0'/>
    </memballoon>
    <rng model='virtio'>
      <backend model='random'>/dev/random</backend>
      <alias name='rng0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
    </rng>
  </devices>
</domain>

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