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[Hans De Boo <hans@xxxxxxxxx>]

I have a very similar problem, which I believe may be related. I have
the RTL8111/8168/8411. Since I upgraded to 13.10 I'm noticing a drop in
network speed. Installing the Realtek driver didn't help, nor other
helpfull tips as disabling IPv6.   When testing raw network speed from
my Ubuntu to my file server I see speeds between 1,1 and 1,5Mb/s.

dd if=/dev/zero bs=50M count=1 | nc 192.168.1.85 1122
1+0 records gelezen
1+0 records geschreven
52428800 bytes (52 MB) gekopieerd, 49,6147 s, 1,1 MB/s

Other computers reach easily 50-80Mb/s. (als on the same cable). I
haven't tested a rollback to 12.04 to check the actual networkspeed with
the old version, or tried a clean install. I may do this to check if all
other sources for this issue can be excluded.

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https://bugs.launchpad.net/bugs/1275161

Title:
  Realtek driver r8169 slow network speed

Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  Network speed variable, some sites not open or very slow (example: amazon.com).
  Replace driver with r8168 from this http://www.realtek.com/downloads/downloadsView.aspx?Langid=1&PNid=5&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false#2 not help.

  ubuntu amd64 13.10 (also tested daily build 14.04 30 Jan 2014)
  kernel 3.11.0-15-generic

  lspci -nn | grep Ethernet
  02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 0c)
  --- 
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dem        1250 F.... pulseaudio
   /dev/snd/controlC1:  dem        1250 F.... pulseaudio
   /dev/snd/pcmC1D0c:   dem        1250 F...m pulseaudio
   /dev/snd/pcmC1D0p:   dem        1250 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg: [  712.730809] hda-intel 0000:00:1b.0: Unstable LPIB (19200 >= 1920); disabling LPIB delay counting
  DistroRelease: Ubuntu 13.10
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: MSI MS-7817
  MarkForUpload: True
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic root=UUID=2982e0ae-6485-4894-9306-01c72c340d13 ro
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  saucy
  Uname: Linux 3.11.0-15-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo video
  dmi.bios.date: 06/20/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V1.0
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H81M-P33 (MS-7817)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV1.0:bd06/20/2013:svnMSI:pnMS-7817:pvr1.0:rvnMSI:rnH81M-P33(MS-7817):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7817
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI

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