kernel-packages team mailing list archive

[Chris J Arges <1423631@xxxxxxxxxxxxxxxxxx>]

Can you explain more about your setup?
Which version of openstack are you running?
How have you setup your instance?
Which operating system / kernel version are you running in your instance?
How are you generating outbound traffic from the instance?
Is the outbound traffic going through other equipment which may be dropping those packets?

In my Trusty/Icehouse deploy, I've deployed instanced and observed the
tapXXXXX interfaces on the compute node and noticed no large amount of
dropped TX packets.

** Changed in: qemu-kvm (Ubuntu)
       Status: Confirmed => Incomplete

** Changed in: qemu-kvm (Ubuntu)
   Importance: Undecided => Medium

** Changed in: qemu (Ubuntu)
   Importance: Undecided => Medium

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

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

-- 
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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:
  Confirmed
Status in qemu package in Ubuntu:
  Incomplete
Status in qemu-kvm package in Ubuntu:
  Incomplete

Bug description:
  I use qemu-kvm in openstack. On highload hypervisor tap interface of net-highload guest drops many TX packets.
  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)
  ---
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Feb 18 12:06 seq
   crw-rw---- 1 root audio 116, 33 Feb 18 12:06 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.14.1-0ubuntu3.7
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-07-01 (234 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  MachineType: Dell Inc. PowerEdge M620
  Package: qemu-kvm
  PciMultimedia:

  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   LC_MESSAGES=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-30-generic root=UUID=5965239d-820a-49a1-9d8e-23a4c1f87ce6 ro
  ProcVersionSignature: Ubuntu 3.16.0-30.40~14.04.1-generic 3.16.7-ckt3
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-30-generic N/A
   linux-backports-modules-3.16.0-30-generic  N/A
   linux-firmware                             1.127.11
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  trusty
  Uname: Linux 3.16.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 01/21/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.2.7
  dmi.board.name: 0T36VK
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 25
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: PowerEdge M1000e
  dmi.modalias: dmi:bvnDellInc.:bvr2.2.7:bd01/21/2014:svnDellInc.:pnPowerEdgeM620:pvr:rvnDellInc.:rn0T36VK:rvrA01:cvnDellInc.:ct25:cvrPowerEdgeM1000e:
  dmi.product.name: PowerEdge M620
  dmi.sys.vendor: Dell Inc.

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