LinuxInsider: Where Is Real-Time Linux?

“Hard real-time Linux has been around for ages, or it may never
appear. It all depends on who you talk to. It also depends on your
requirements. A two-second interrupt latency may be acceptable for
some applications, and even many Linux implementations can easily
handle interrupts within tens of milliseconds.

“Part of the problem is that several solutions have existed for
many years, like FSMLabs RTLinux, and MontaVista Linux. Both take a
different approach to improving the base Linux core interrupt
performance. RTLinux drops in a microkernel, RTCore, underneath
standard Linux.

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