kernel-packages team mailing list archive

[Seyeong Kim <seyeong.kim@xxxxxxxxxxxxx>]

Public bug reported:

[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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: sts vivid

** Tags added: sts vivid

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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:
  New

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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