[LAD] Timers, hpet, hrtimer

Jussi Laako jussi at sonarnerd.net
Tue Nov 10 19:34:28 UTC 2009

fons at kokkinizita.net wrote:
> So you're just reading it, not waiting on it ? That indeed
> should be 'free'. 

Yes, we just need to read it. JACK used to use TSC for that, and HPET
support was introduced as similar low-cost alternative to deal with
variable clock frequencies (important on mobile things) and unsynced
TSC. Use of syscalls is kind of fallback.

Audio hardware (interrupts) act as a waitable time source.

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