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realtime:documentation:known_limitations [2022/03/14 07:41] bigeasy [Disabled CONFIG_ options] Add disabled options back and add a version when it was no longer disabled |
realtime:documentation:known_limitations [2023/10/02 20:16] (current) costa.shul - elixir |
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===== Disabled CONFIG_ options ===== | ===== Disabled CONFIG_ options ===== | ||
- | Several features are disabled by CONFIG_PREEMPT_RT_FULL=y because of incompatibility. | + | Several features are disabled by CONFIG_PREEMPT_RT=y because of incompatibility. |
<WRAP center round todo 80%> | <WRAP center round todo 80%> | ||
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* CONFIG_TRANSPARENT_HUGEPAGE | * CONFIG_TRANSPARENT_HUGEPAGE | ||
+ | * CONFIG_DRM_I915 | ||
+ | * CONFIG_NUMA_BALANCING | ||
+ | * CONFIG_LEDS_TRIGGER_CPU | ||
* CONFIG_KVM_MPIC (powerpc) | * CONFIG_KVM_MPIC (powerpc) | ||
* CONFIG_OPROFILE (until v5.12-rc2-rt1) | * CONFIG_OPROFILE (until v5.12-rc2-rt1) | ||
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==== EFI ==== | ==== EFI ==== | ||
- | EFI runtime services are disabled because using them may case high latencies. This includes accessing the RTC device or updating the variables. | + | [[https://elixir.bootlin.com/linux/latest/A/ident/CONFIG_EFI_DISABLE_RUNTIME|EFI runtime services are disabled]] because using them may case high latencies. This includes accessing the RTC device or updating the variables. |
If you need to use the EFI runtime services add **efi=runtime** to the kernel command line. | If you need to use the EFI runtime services add **efi=runtime** to the kernel command line. | ||