To get an idea of the length of the tail: Suppose a deadline of 6ms to produce an audio buffer. If 0.01% of the callbacks choke on a lock, we get a dropout onc

To get an idea of the length of the tail: Suppose a deadline of 6ms to produce an audio buffer. If 0.01% of the callbacks choke on a lock, we get a dropout once a minute, which is quite a lot. This means we're interested in the 99.99th percentile.