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Linux: History Of Nice Levels

In a continued thread about how the recently merged Completely Fair Scheduler affects the nice command, Ingo Molnar offered a history of nice levels in the Linux kernel. He began by describing the three most frequent complaints he has received, first was "nice levels were always so weak under Linux that people continuously bugged me about making nice +19 tasks use up much less CPU time", second was "the fact that nice level behavior depended on the _absolute_ nice level as well, while the nice API itself is fundamentally 'relative'", and third was "negative nice levels were not 'punchy enough', so lots of people had to resort to run audio (and other multimedia) apps under RT priorities such as SCHED_FIFO."

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