Kernel Config

Realtime Pre-emption model

This is the main switch to enable a realtime kernel when using the realtime patches

  • CONFIG_PREEMPT_RT
    General -> Preemption Model -> Select full real time

Debian Realtime

Looking at the Debian realtime options the below appears to be set for the realtime kernel

KVM appears to be disabled, it doesn't seem to make a difference for the newer kernels.
I think originally it was required for realtime to work on some platforms.
By having it disabled I think HAVE_POSIX_CPU_TIMERS_TASK_WORK is then enabled which then allows for ARCH_SUPPORTS_RT on some platforms, although I don't think it's mandatory on aarch64.

  • CONFIG_KVM disabled

The enabling of the tracer options should in theory allow for gathering information as to where latency issues might be present so might be useful at a later point.

  • CONFIG_RCU_EXPERT enabled
  • CONFIG_SCHED_TRACER already enabled
  • CONFIG_HWLAT_TRACER enabled
  • CONFIG_OSNOISE_TRACER enabled
  • CONFIG_TIMERLAT_TRACER enabled

This doesn't have an impact on latency but could be interesting for latency tests possibly.
This is something I've enabled

  • CONFIG_HIST_TRIGGERS
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