canonical-ubuntu-qa team mailing list archive

[Juerg Haefliger <2119514@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Starting with kernel 6.11 there is no longer a dedicated lowlatency
kernel flavor. Instead, the generic kernel flavor is used along with
some kernel parameters that make it lowlatency. Ubuntu Studio uses the
lowlatency kernel, so for that flavor, the manual tests need to be
amended to verify that the correct kernel parameters are applied and the
running kernel is indeed configured for lowlatency.

This needs to be verified both for the kernel that runs in the live
session as well as the kernel that runs after installation.

For the record, the grub.cfg snippet that sets the kernel parameters is provided by the lowlatency-kernel package:
https://git.launchpad.net/ubuntu/+source/lowlatency-kernel/tree/debian/99-lowlatency.cfg

For the manual test, verify that /proc/cmdline contains 'preempt=full'
and 'rcu_nocbs=all'.

** Affects: ubuntu-manual-tests
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2119514

Title:
  Check for lowlatency kernel settings

Status in Ubuntu Manual Tests:
  New

Bug description:
  Starting with kernel 6.11 there is no longer a dedicated lowlatency
  kernel flavor. Instead, the generic kernel flavor is used along with
  some kernel parameters that make it lowlatency. Ubuntu Studio uses the
  lowlatency kernel, so for that flavor, the manual tests need to be
  amended to verify that the correct kernel parameters are applied and
  the running kernel is indeed configured for lowlatency.

  This needs to be verified both for the kernel that runs in the live
  session as well as the kernel that runs after installation.

  For the record, the grub.cfg snippet that sets the kernel parameters is provided by the lowlatency-kernel package:
  https://git.launchpad.net/ubuntu/+source/lowlatency-kernel/tree/debian/99-lowlatency.cfg

  For the manual test, verify that /proc/cmdline contains 'preempt=full'
  and 'rcu_nocbs=all'.

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