Also, in practice the scheduler for the RT-patch kernel is a little more reliable for SCHED_FIFO threads/processes. This allows them to run smaller rendering buffers without fear that the buffer will under-run because they didn't get scheduled at the right time.
You can get "good" results with a vanilla kernel (in practice, around 20ms). With an RT-patch you can potentially get "better." Most probably won't notice the difference, but some might.
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