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Learn about CPU isolation challenges and Inter-Processor Interrupt (IPI) interference in this 19-minute conference talk from the Linux Plumbers Conference. Explore how CPU isolation allows system administrators to shield specific CPUs from kernel interference, but discover why complete isolation remains elusive due to housekeeping CPU activities that trigger IPIs to isolated CPUs. Examine real-world examples from Red Hat's experience with IPIs caused by instruction patching (such as static key updates) and TLB flushes (including those from vmap'd stacks of dying tasks). Review the current mitigation strategies developed over recent years, understand ongoing technical challenges, and discuss future development directions for improving CPU isolation effectiveness in Linux systems.
