🏗️ DevOps & Infrastructure

PREEMPT_RT Locks Linux Jitter at 70µs Under Brutal Load – Stock Kernel Spikes to 650µs

Developers chasing microsecond precision in Linux have long battled scheduling chaos. One Software PLC builder's stress test flips the script: PREEMPT_RT delivers 10x better jitter control.

theAIcatchup Apr 07, 2026 3 min read
Bar chart of jitter measurements: standard Linux at 650µs vs PREEMPT_RT at 70µs under heavy stress-ng load

⚡ Key Takeaways

  • PREEMPT_RT bounds worst-case jitter to 70µs under extreme stress, vs 650µs for stock Linux. 𝕏
  • Viable for Software PLCs, potentially disrupting $15B industrial PC market. 𝕏
  • Tune with CPU isolation and IRQ affinity for even tighter control. 𝕏
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theAIcatchup

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#Linux kernel jitter #PREEMPT_RT #Software PLC #jitter measurement #real-time Linux #real-time jitter #scheduling jitter #stress-ng testing

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Originally reported by Reddit r/programming

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