Issue
What were you trying to do that didn't work?
Basically, isolating cores with the isolated_cores= config is not working with the realtime profiles. There are two cases that have been tried:
ARM bare-metal system with 80 cores, running the real-time kernel:
Configure isolated cores in /etc/tuned/realtime-variables.conf to isolated_cores=1,2,3,4,5
Activate the profile "# tuned-adm profile realtime"
Check TUNED_BOOT_CMDLINE in /etc/tuned/bootcmdline, all cores except core0 are passed to isolcpus= (ie. cores 1 to 79 are passed)
RHEL9 RT KVM guest with 4 vCPUs:
Configure isolated cores in /etc/tuned/realtime-variables.conf to isolated_cores=1-3
Activate the profile "# tuned-adm profile realtime"
Check TUNED_BOOT_CMDLINE in /etc/tuned/bootcmdline, no CPUs are passed to the isolcpus= kernel command-line. It only contains "isolcpus=managed_irq,domain,"
Please provide the package NVR for which bug is seen:
ARM versions:
kernel-rt-5.14.0-388.el9.aarch64
kernel-rt-core-5.14.0-388.el9.aarch64
kernel-rt-modules-5.14.0-388.el9.aarch64
kernel-rt-modules-core-5.14.0-388.el9.aarch64
kernel-rt-modules-extra-5.14.0-388.el9.aarch64
tuned-2.21.0-1.el9_3.noarch
tuned-profiles-cpu-partitioning-2.21.0-1.el9_3.noarch
tuned-profiles-nfv-2.21.0-1.el9_3.noarch
tuned-profiles-nfv-guest-2.21.0-1.el9_3.noarch
tuned-profiles-nfv-host-2.21.0-1.el9_3.noarch
tuned-profiles-realtime-2.21.0-1.el9_3.noarch
x86 guest versions:
kernel-rt-5.14.0-388.el9.x86_64
kernel-rt-core-5.14.0-388.el9.x86_64
kernel-rt-modules-5.14.0-388.el9.x86_64
kernel-rt-modules-core-5.14.0-388.el9.x86_64
tuned-2.21.0-1.el9_3.noarch
tuned-profiles-nfv-host-2.21.0-1.el9_3.noarch
tuned-profiles-realtime-2.21.0-1.el9_3.noarch
How reproducible:
Described above.
Expected results
The isolcpus kernel command-line should contain the same CPUs as passed to isolated_cores=
Actual results
Described above.
