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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Fix released in 3.19.0-47.53

** Changed in: linux (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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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:
  Invalid
Status in linux source package in Vivid:
  Fix Released

Bug description:
  [Impact]

  Ubuntu VMs between different location in Azure , especially North Europe and East Europe in this case, have network performance issue.
  It should be around 100MB/s speed between them. but it's around 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 (ubuntu-vivid)

  [Testcase]

  Make 2 VMs on North Europe, West Europe each.
  Then run below test script

  NE VM

  - netcat & nload
   while true; do netcat -l 8080 < /dev/zero; done;
   nload -u M eth0 ( need nload pkg )

  - iperf
   iperf -s -f M

  WE VM

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

  - iperf
   iperf -c HOST -f M

  Network performance dropping can be seen frequently.

  More Tests
  http://pastebin.ubuntu.com/13657083/

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