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

[Michael Kazakov]

apport information

** Tags added: apport-collected trusty

** Description changed:

  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)
+ --- 
+ 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.

** Attachment added: "BootDmesg.txt"
   https://bugs.launchpad.net/bugs/1423631/+attachment/4323625/+files/BootDmesg.txt

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Title:
  tap interface drops many packets on highload systems

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