[Bug 1423631] [NEW] tap interface drops many packets on highload systems

[Michael Kazakov]

Public bug reported:

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)

** Affects: qemu-kvm (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- tap interface drors may packages on highload sysstems
+ tap interface drops many packages on highload systems

** Summary changed:

- tap interface drops many packages on highload systems
+ tap interface drops many packets on highload systems

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to qemu-kvm in Ubuntu.
https://bugs.launchpad.net/bugs/1423631

Title:
  tap interface drops many packets on highload systems

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/qemu-kvm/+bug/1423631/+subscriptions