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Message #139801
[Bug 1423631] Re: tap interface drops many packets on highload systems
I was able to resolve this with the below udev rule:
# cat /etc/udev/rules.d/60-tap.rules
KERNEL=="tap*", RUN+="/sbin/ip link set %k txqueuelen 10000"
#
I used the below to reload udev
udevadm control --reload-rules
I then used the below to apply the rules to already created interfaces:
udevadm trigger --attr-match=subsystem=net
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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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