[Bug 251125] audio/jack: update to jack2 or add new port audio/jack2

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251125

--- Comment #47 from Hans Petter Selasky <hselasky at FreeBSD.org> ---
> How does the fragment size affect performance and timing tolerance?
> Are single fragments only processed when they are full, or more continuously like the scatter / gather buffers in read(...) and write(...)?

Smaller fragment size means more interrupts (CPU usage) and a higher chance of
glitches. But also improves the responsiveness of live synth apps.

A fragment is usually the smallest entity the audio driver can process. With
USB audio this entity is fixed and can be slightly controlled by
hw.usb.uaudio.buffer_ms to 2,3,4,5,6,7 or 8 ms.

Other drivers select the buffer size given by the user. This also depends on
the use of vchans. Bitperfect mode is different, as you know.

--HPS

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