kernel-packages team mailing list archive

[Dexuan Cui <decui@xxxxxxxxxxxxx>]

When the issue happens (it looks due to the layout of the struct somehow...), can you try the small workaround patch at 
https://patchwork.ozlabs.org/patch/518469/?

I paste it below:

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 88a0069..7233790 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -132,7 +132,9 @@  static inline bool dev_xmit_complete(int rc)
  *	used.
  */
 
-#if defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
+#if IS_ENABLED(CONFIG_HYPERV_NET)
+# define LL_MAX_HEADER 224
+#elif defined(CONFIG_WLAN) || IS_ENABLED(CONFIG_AX25)
 # if defined(CONFIG_MAC80211_MESH)
 #  define LL_MAX_HEADER 128
 # else

If this can work, please use the formal fixes from KY, which have been in linux-next:
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/log/?qt=grep&q=hv_netvsc (please check the patches of the past week)

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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:
  In Progress

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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