kernel-packages team mailing list archive

[Stéphan Kochen <stephan@xxxxxxxxx>]

Public bug reported:

Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the
kernel log:

    xen_netfront: xennet: skb rides the rocket: 19 slots

Each of these messages corresponds to a dropped TX packet, and
eventually causes our application's connections to break and timeout.

The problem appears when network load increases. We have Node.js
processes doing pubsub with a Redis server, and these are most visibly
affected, showing frequent connection loss. The processes talk to each
other using the private addresses EC2 allocates to the machines.

Notably, the default MTU on the network interface seems to have gone up
from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to 1500
seems to drastically reduce dropped packets. (Can't say for certain if
it completely eliminates the problem.)

The machines we run are started from ami-896c96fe.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-24-generic 3.13.0-24.46
ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 May  9 09:01 seq
 crw-rw---- 1 root audio 116, 33 May  9 09:01 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
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: 'iw'
Date: Fri May  9 09:11:18 2014
Ec2AMI: ami-896c96fe
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: eu-west-1c
Ec2InstanceType: c3.large
Ec2Kernel: aki-52a34525
Ec2Ramdisk: unavailable
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
Lspci:
 
Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
PciMultimedia:
 
ProcFB:
 
ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-24-generic N/A
 linux-backports-modules-3.13.0-24-generic  N/A
 linux-firmware                             N/A
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug ec2-images trusty

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https://bugs.launchpad.net/bugs/1317811

Title:
  Dropped packets on EC2, "xen_netfront: xennet: skb rides the rocket: x
  slots"

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Running Ubuntu 14.04 LTS on EC2, we see a lot of the following in the
  kernel log:

      xen_netfront: xennet: skb rides the rocket: 19 slots

  Each of these messages corresponds to a dropped TX packet, and
  eventually causes our application's connections to break and timeout.

  The problem appears when network load increases. We have Node.js
  processes doing pubsub with a Redis server, and these are most visibly
  affected, showing frequent connection loss. The processes talk to each
  other using the private addresses EC2 allocates to the machines.

  Notably, the default MTU on the network interface seems to have gone
  up from 1500 on 13.10, to 9000 in 14.04 LTS. Reducing the MTU back to
  1500 seems to drastically reduce dropped packets. (Can't say for
  certain if it completely eliminates the problem.)

  The machines we run are started from ami-896c96fe.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: User Name 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 May  9 09:01 seq
   crw-rw---- 1 root audio 116, 33 May  9 09:01 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  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: 'iw'
  Date: Fri May  9 09:11:18 2014
  Ec2AMI: ami-896c96fe
  Ec2AMIManifest: (unknown)
  Ec2AvailabilityZone: eu-west-1c
  Ec2InstanceType: c3.large
  Ec2Kernel: aki-52a34525
  Ec2Ramdisk: unavailable
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci:
   
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  PciMultimedia:
   
  ProcFB:
   
  ProcKernelCmdLine: root=LABEL=cloudimg-rootfs ro console=hvc0
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             N/A
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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