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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I built a Vivid test kernel with the requested commit.  There were some
pre-req commits that were needed as well.  The test kernel has the
following commits applied:

4c0d9e0 hv_netvsc: Use the xmit_more skb flag to optimize signaling the host
2e16490 Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()
b30dd3a Drivers: hv: vmbus: Suport an API to send pagebuffers with additional control
f93ca43 Drivers: hv: vmbus: Suport an API to send packet with additional control
068352e  hv_netvsc: Fix a bug in netvsc_start_xmit()
be93771  hv_netvsc: Implement partial copy into send buffer
888ec2b  hv_netvsc: Fix the packet free when it is in skb headroom
a0d749b  hv_netvsc: Eliminate memory allocation in the packet send path
ef9700b  hv_netvsc: Cleanup the test for freeing skb when we use sendbuf mechanism
929b8e8 hv_netvsc: Implement batching in send buffer

The Vivid test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1454892/


Can you test this kernel and see if it resolves the bug?  If it does, I'll build test kernels for all the other supported releases as well.

Thanks in advance!

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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:
  Triaged
Status in linux source package in Precise:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged
Status in linux source package in Wily:
  Triaged

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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