Sleeping tasks not always scheduled on real time kernel

Solution Verified - Updated -

Issue

  • Software running on isolated CPU is freezing randomly.
  • Timers created by a non-RT application are triggered late or not at all, causing a significant performance hit or freezing of that application.

Environment

  • Red Hat Enterprise Linux (RHEL) for Real Time 8
  • Kernel 4.18.0-305.14.1.rt7.86.el8_4.x86_64 and later
  • Adaptive-tick mode enabled (nohz_full)
  • Application running on isolated CPUs

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