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[Launchpad Bug Tracker <1454892@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux-lts-utopic -
3.16.0-48.64~14.04.1

---------------
linux-lts-utopic (3.16.0-48.64~14.04.1) trusty; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1487225

  [ Upstream Kernel Changes ]

  * sysfs: Create mountpoints with sysfs_create_mount_point
    - LP: #1487125

linux-lts-utopic (3.16.0-47.63~14.04.1) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1485127

  [ Brad Figg ]

  * CONFIG: CONFIG_DELL_RBTN=m

  [ Upstream Kernel Changes ]

  * dell-rbtn: Dell Airplane Mode Switch driver
    - LP: #1440949
  * dell-rbtn: Export notifier for other kernel modules
  * dell-laptop: Use dell-rbtn instead i8042 filter when possible
  * net: Remove ndo_xmit_flush netdev operation, use signalling instead.
    - LP: #1454892
  * hyperv: Increase the buffer length for netvsc_channel_cb()
    - LP: #1454892
  * hyperv: Add support for vNIC hot removal
    - LP: #1454892
  * hyperv: fix sparse warnings
    - LP: #1454892
  * hv_netvsc: Implement batching in send buffer
    - LP: #1454892
  * hv_netvsc: Cleanup the test for freeing skb when we use sendbuf
    mechanism
    - LP: #1454892
  * hv_netvsc: Eliminate memory allocation in the packet send path
    - LP: #1454892
  * hv_netvsc: Fix the packet free when it is in skb headroom
    - LP: #1454892
  * hv_netvsc: Implement partial copy into send buffer
    - LP: #1454892
  * hv_netvsc: Fix a bug in netvsc_start_xmit()
    - LP: #1454892
  * Drivers: hv: vmbus: Suport an API to send packet with additional
    control
    - LP: #1454892
  * Drivers: hv: vmbus: Suport an API to send pagebuffers with additional
    control
    - LP: #1454892
  * Drivers: hv: vmbus: Export the vmbus_sendpacket_pagebuffer_ctl()
    - LP: #1454892
  * hv_netvsc: Use the xmit_more skb flag to optimize signaling the host
    - LP: #1454892

 -- Luis Henriques <luis.henriques@xxxxxxxxxxxxx>  Thu, 20 Aug 2015
23:10:28 +0100

-- 
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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:
  Fix Released
Status in linux-lts-utopic package in Ubuntu:
  Fix Committed
Status in linux source package in Precise:
  Confirmed
Status in linux source package in Trusty:
  Confirmed
Status in linux-lts-utopic source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
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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