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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

One of the prerequisite commits required for this patch to apply to lts-
backport-utopic and Trusty(Commit 0b725a2c) was making changes to the
igb driver.

I created  a new backport of this commit, so it does not touch igb.
There was good testing in bug 1492146 with this kernel, see commits 34
-> 37.

Can you also test this linux-lts-utopic kernel to see if it resolves
this bug?  If it does, I'll build a Trusty test kernel for testing.  We
can then re-submit the SRU request the fixes will no longer cause the
regression.

The linux-lts-utopic kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1454892/lts-backport-utopic/

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https://bugs.launchpad.net/bugs/1454892

Title:
  [Hyper-V] hv_netvsc: Use the xmit_more skb flag to optimize signaling
  the host

Status in linux package in Ubuntu:
  In Progress
Status in linux-lts-utopic package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  In Progress
Status in linux-lts-utopic source package in Trusty:
  In Progress
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Fix Released

Bug description:
  hv_netvsc: Use the xmit_more skb flag to optimize signaling the host
  Based on the information given to this driver (via the xmit_more skb flag),
  we can defer signaling the host if more packets are on the way. This will help
  make the host more efficient since it can potentially process a larger batch of
  packets. Implement this optimization.

  Upstream commit: https://git.kernel.org/cgit/linux/kernel/git/davem
  /net-next.git/commit/?id=82fa3c776e5abba7ed6e4b4f4983d14731c37d6a

  This commit may imply other commits previously requested, for example
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1452074

  Requested for all typical Hyper-V targets: 15.10, 15.04, 14.10, 14.04,
  14.04 HWE, 12.02, and 12.02 HWE

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