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ELJOnline: Real-Time and Linux, Part 2: The Preemptible Kernel

Apr 11, 2002, 05:00 (3 Talkback[s])
(Other stories by Kevin Dankwardt)

"With around Linux kernel release 2.2, the issue of kernel preemptibility began to get quite a lot of attention. Paul Barton-Davis and Benno Senoner, for example, wrote a letter (which in addition was signed by many others) to Linus Torvalds, asking that 2.4 please include significantly reduced preemption delays.

"Their request was based on their desire to have Linux function well with audio, music and MIDI. Senoner produced some benchmarking software that demonstrated that the 2.2 kernel (and later the 2.4 kernel) had worst-case preemption latencies on the order of 100ms (reference ). Latencies of this magnitude are unacceptable for audio applications. Conventional wisdom seems to say that latencies on the order of no more than a few milliseconds are required..."

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