grub/rootfs.cfg: add 'isolate CPU0 (only for PREEMPT_RT)' menu option #3875
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This will set the 'isolcpus=inverse,0 nohz_full=inverse,0' kernel command line, which by default pins all the service tasks running on EVE to the CPU0, isolating other CPUs to VM needs and prevents scheduling interference. This command line uses the 'inverse' flag, which was introduced here: lf-edge/eve-kernel#90 Now the configuration is general and does not depend on the number of CPUs. This option makes sense to set for the PREEMPT_RT kernel, which uses the 'inverse' flag. Signed-off-by: Roman Penyaev <r.peniaev@gmail.com>
eriknordmark
approved these changes
Apr 23, 2024
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This will set the 'isolcpus=inverse,0 nohz_full=inverse,0' kernel command line, which by default pins all the service tasks running on EVE to the CPU0, isolating other CPUs to VM needs and prevents scheduling interference.
This command line uses the 'inverse' flag, which was introduced here:
lf-edge/eve-kernel#90
Now the configuration is general and does not depend on the number of CPUs. This option makes sense to set for the PREEMPT_RT kernel, which uses the 'inverse' flag.
XXX kernel version for RT is not yet updated, build server is gone, this change will follow.