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[Seyeong Kim <seyeong.kim@xxxxxxxxxxxxx>]

It also can be reproduced by using iperf

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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:
  Confirmed
Status in linux source package in Vivid:
  Confirmed

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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