Hello Tim, > My understanding is that ALSA placed a hard-coded limit on the > snd-hrtimer of around 1024Hz a couple of years ago. > > The snd-hrtimer used to be able to be set very high frequencies > until one day it wouldn't. I contacted ALSA and they told me > about this new hard-coded limit. > > This sent me scrambling to re-order the midi timer preference > in MusE because it seems the RTC timer is now the only timer > that can give you anything above 1024Hz. > > Have I got this correct? I checked sound/core/hrtimer.c of a current linux kernel source and I don't see any limits of 1000 or 1024. And when I check on my system with `cat /proc/asound/timers` I see the resolution of the system timer is 1000 µs, so 1 ms (which I think equals the 1000 HZ kernel setting I use) while the HR timer has a resolution of 0.001 µs, so 1 ns. If I search for .resolution in /proc/timer_list I see that same value, so 1 ns. So my guess is that snd-hrtimer goes way beyond 1000 HZ and doesn't seem to have a hard-coded limit of itself. Best, Jeremy
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