https://lists.ubuntu.com/archives/kernel-team/2023-October/146418.html

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https://bugs.launchpad.net/bugs/2040300

Title:
  Azure: Improve SQL DB latency

Status in linux-azure package in Ubuntu:
  Fix Released
Status in linux-azure source package in Jammy:
  In Progress
Status in linux-azure source package in Lunar:
  In Progress
Status in linux-azure source package in Mantic:
  In Progress

Bug description:
  SRU Justification

  [Impact]

  TCP pingpong threshold is 1 by default. But some applications, like SQL DB
  may prefer a higher pingpong threshold to activate delayed acks in quick
  ack mode for better performance.

  There is no single value that fits all applications.
  Add net.ipv4.tcp_pingpong_thresh sysctl tunable, so it can be tuned for
  optimal performance based on the application needs.

  [Test Case]

  Microsoft tested

  [Regression Potential]

  Should be zero since default behavior is unchanged.

  [Other Info]

  SF: #00357415

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