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[Po-Hsu Lin <1864233@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux-azure-4.15 (Ubuntu)
       Status: New => Fix Released

** Changed in: linux-azure (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1864233

Title:
  Commits to resolve high network latency

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure-4.15 package in Ubuntu:
  Fix Released
Status in linux-azure source package in Xenial:
  Fix Released
Status in linux-azure-4.15 source package in Xenial:
  Invalid
Status in linux-azure source package in Bionic:
  Invalid
Status in linux-azure-4.15 source package in Bionic:
  Fix Released

Bug description:
  An issue has been identified with the NETVSC driver on Azure VMs. This
  issues has been fixed by four patches, which are available in the
  mainline kernel.

  The issues is the following: 
  Outgoing traffic is sent from the guest to the Azure host over multiple parallel channels.  The issue causes the traffic to be unevenly balanced across the channels, which results in a physical CPU on the Azure host becoming overloaded. In turn, the network traffic on the overloaded channel experiences significantly higher latency.  This higher latency is causing issues for customers.

  This issue is resolved by the following four mainline commits:

  71f21959dd55 ("hv_netvsc: Fix offset usage in netvsc_send_table()")
  171c1fd98df3 ("hv_netvsc: Fix send_table offset in case of a host bug")
  c39ea5cba5a2 ("hv_netvsc: Fix tx_table init in rndis_set_subchannel()")
  b0689faa8efc ("hv_netvsc: Fix unwanted rx_table reset")

  These four commits have been submitted to upstream stable.

  We would like to request these commits in Azure kernels for Xenial and
  Bionic

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