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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1521053

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1521053

Title:
  Network Performance dropping between vms on different location in
  Azure

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  [Impact]

  Ubuntu VM in Azure has network performance issue when check by using netcat&nload
  Normal bandwidth is 50MB/s ~ 100MB/s, but it's 0.3MB/s when dropping happens

  [Fix]

  Upstream development
  0d158852a8089099a6959ae235b20f230871982f ("hv_netvsc: Clean up two unused variables")

  It's affected over 3.19.0-28-generic (vivid)

  With this commit, I confirmed that the problem has gone by the
  testing.

  [Testcase]

  This is only for Azure service.

  Make 2 vms on North Europe,  West Europe and run below test script

  NE

   while true; do netcat -l 8080 < /dev/zero; done;

   nload -u M eth0 ( need nload pkg )

  WE

   for i in {1..1000} 
   do 
    timeout 30s nc NE_HOST 8080 > /dev/null 
   done

  Network performance dropping can be seen frequently

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