This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1423631

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1423631

Title:
  tap interface drops many packets on highload systems

Status in linux package in Ubuntu:
  Incomplete
Status in qemu package in Ubuntu:
  New
Status in qemu-kvm package in Ubuntu:
  New

Bug description:
  I use qemu-kvm in openstak. On highload hypervisor tap interface of 
net-highload gues drops many TX packages.
  Network options of qemu-system-x86_64  "... -netdev 
tap,fd=30,id=hostnet0,vhost=on,vhostfd=31 -device 
virtio-net-pci,netdev=hostnet0,id=net0,mac=fa:16:3e:86:67:7b,bus=pci.0,addr=0x3..."

  Network domin config:

      <interface type='bridge'>
        <mac address='fa:16:3e:86:67:7b'/>
        <source bridge='qbre4009073-0b'/>
        <target dev='tape4009073-0b'/>
        <model type='virtio'/>
        <alias name='net0'/>
        <address type='pci' domain='0x0000' bus='0x00' slot='0x03' 
function='0x0'/>
      </interface>

  tape4009073-0b Link encap:Ethernet  HWaddr fe:16:3e:86:67:7b  
            inet6 addr: fe80::fc16:3eff:fe86:677b/64 Scope:Link
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:1587622634 errors:0 dropped:0 overruns:0 frame:0
            TX packets:1484106438 errors:0 dropped:460259 overruns:0 carrier:0
            collisions:0 txqueuelen:500 
            RX bytes:877878711500 (877.8 GB)  TX bytes:3071846828531 (3.0 TB)

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