Public bug reported: SRU Justification
[Impact] Microsoft has requested that CONFIG_RT_GROUP_SCHED be enabled. This option has no discernible runtime impact in the default case. As quoted from research performed by Colin King, "I ran some synthetic stress-ng throughput and latency tests with and without CONFIG_RT_GROUP_SCHED on CONFIG_RT_GROUP_SCHED. I don't see enough variation in the throughput or latency to warrant any concern about enabling this option. We have quite a bit of small jitter on the results, but overall the kernel results are similar enough to make me feel OK to enable this option for Focal." [Test Case] Microsoft has tested this option using kernels at https://kernel.ubuntu.com/~rtg/azure-rt-group-sched-sf00314473/. The customer requesting this config option verified that it satisfied their requirements. Microsft also determined that there were no performance regressions for the default case, i.e., when no RT priority threads were created. [Where things could go awry] Adding options to the scheduler could impact work loads that we have yet to observe. [Other Info] SF: 00314473 ** Affects: linux-azure (Ubuntu) Importance: Undecided Assignee: Tim Gardner (timg-tpi) Status: New ** Affects: linux-azure (Ubuntu Focal) Importance: Undecided Assignee: Tim Gardner (timg-tpi) Status: New ** Affects: linux-azure (Ubuntu Hirsute) Importance: Undecided Assignee: Tim Gardner (timg-tpi) Status: New ** Affects: linux-azure (Ubuntu Impish) Importance: Undecided Assignee: Tim Gardner (timg-tpi) Status: New ** Also affects: linux-azure (Ubuntu Hirsute) Importance: Undecided Status: New ** Also affects: linux-azure (Ubuntu Focal) Importance: Undecided Status: New ** Also affects: linux-azure (Ubuntu Impish) Importance: Undecided Status: New ** Changed in: linux-azure (Ubuntu Focal) Assignee: (unassigned) => Tim Gardner (timg-tpi) ** Changed in: linux-azure (Ubuntu Hirsute) Assignee: (unassigned) => Tim Gardner (timg-tpi) ** Changed in: linux-azure (Ubuntu Impish) Assignee: (unassigned) => Tim Gardner (timg-tpi) -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-azure in Ubuntu. https://bugs.launchpad.net/bugs/1939024 Title: linux-azure Enable CONFIG_RT_GROUP_SCHED Status in linux-azure package in Ubuntu: New Status in linux-azure source package in Focal: New Status in linux-azure source package in Hirsute: New Status in linux-azure source package in Impish: New Bug description: SRU Justification [Impact] Microsoft has requested that CONFIG_RT_GROUP_SCHED be enabled. This option has no discernible runtime impact in the default case. As quoted from research performed by Colin King, "I ran some synthetic stress-ng throughput and latency tests with and without CONFIG_RT_GROUP_SCHED on CONFIG_RT_GROUP_SCHED. I don't see enough variation in the throughput or latency to warrant any concern about enabling this option. We have quite a bit of small jitter on the results, but overall the kernel results are similar enough to make me feel OK to enable this option for Focal." [Test Case] Microsoft has tested this option using kernels at https://kernel.ubuntu.com/~rtg/azure-rt-group-sched-sf00314473/. The customer requesting this config option verified that it satisfied their requirements. Microsft also determined that there were no performance regressions for the default case, i.e., when no RT priority threads were created. [Where things could go awry] Adding options to the scheduler could impact work loads that we have yet to observe. [Other Info] SF: 00314473 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-azure/+bug/1939024/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
