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  Slow send speed with Intel I219-V on Ubuntu 18.04.1

Status in HWE Next:
Status in linux package in Ubuntu:
  In Progress
Status in linux-oem-5.6 package in Ubuntu:
Status in linux-oem-osp1 package in Ubuntu:
Status in linux source package in Bionic:
  Fix Committed
Status in linux-oem-osp1 source package in Bionic:
  In Progress
Status in linux source package in Eoan:
  Fix Committed
Status in linux source package in Focal:
  Fix Committed
Status in linux-oem-5.6 source package in Focal:
  In Progress
Status in linux source package in Groovy:
  In Progress

Bug description:
  The throughput measured by iperf3 is around 70% of 1Gbps (Intel I219-LM
  I219 is a rather cheap NIC and it impacts its throughput if TSO(TCP
  segmentation offload) is enabled.                              
  Disable TSO on NIC and move this task back to CPU fixes this issue.
  The impact of CPU loading is little to none.
  On target machine with Xeon(R) CPU E3-1505L v6 @ 2.20GHz(4c8t), the CPU
  usage of iperf3 increases from 1% to 4%
  [ ID] Interval Transfer Bandwidth Retr
  [ 4] 0.00-10.00 sec 918 MBytes 770 Mbits/sec 0 sender
  [ 4] 0.00-10.00 sec 916 MBytes 769 Mbits/sec receiver

  [ ID] Interval Transfer Bandwidth Retr
  [ 4] 0.00-10.00 sec 1.09 GBytes 936 Mbits/sec 0 sender
  [ 4] 0.00-10.00 sec 1.09 GBytes 934 Mbits/sec receiver

  [Regression Potential]
  Low, disable TSO on Ethernet chip will move the TCP segmentation task
  to CPU. This increase CPU loading a little bit, and should not introduce
  any regression. 


  Testing with iperf3 send speed is only 750mbps while receive speed is
  normal - 940mbps.

  Ubuntu 18.04.1
  Msi b250m mortar
  ProblemType: Bug
  ApportVersion: 2.20.9-0ubuntu7.5
  Architecture: amd64
   /dev/snd/controlC0:  django     1016 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 18.04
  InstallationDate: Installed on 2018-11-09 (6 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
   enp0s31f6  no wireless extensions.

   lo        no wireless extensions.
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: MSI MS-7A69
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-39-generic 
root=UUID=991b4393-3308-4615-97c8-9854b3bdc67e ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
   linux-restricted-modules-4.15.0-39-generic N/A
   linux-backports-modules-4.15.0-39-generic  N/A
   linux-firmware                             1.173.1

  Tags:  bionic
  Uname: Linux 4.15.0-39-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 06/29/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: A.60
  dmi.board.asset.tag: Default string B250M MORTAR ARCTIC (MS-7A69)
  dmi.board.vendor: MSI
  dmi.board.version: 2.0
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 2.0
dmi:bvnAmericanMegatrendsInc.:bvrA.60:bd06/29/2018:svnMSI:pnMS-7A69:pvr2.0:rvnMSI:rnB250MMORTARARCTIC(MS-7A69):rvr2.0:cvnMSI:ct3:cvr2.0: Default string MS-7A69
  dmi.product.version: 2.0
  dmi.sys.vendor: MSI

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