[Qtractor-devel] HR timer

[Ralf M. <ral...@al...>]

Hi :)

I never tried to launch Qtractor by

$ qtractor <filename.qtr>

maybe it's possible to restore a HR timer session this way. I'll test 
this as soon as possible.

I've got a question about HR timer settings.

1. Is there the need to configure it in /etc/sysctl.conf by

dev.hpet.max-user-freq=<value>

or will it also be fine, if I set it by echo to

/proc/sys/dev/hpet/max-user-freq

thus it will get lost after a reboot, but that doesn't matter, because 
by a session handler script I'll run

sudo chgrp audio /dev/hpet
sudo modprobe snd-hrtimer
jackd -Rch -dalsa -dhw:0 -r96000 -p512 -n2 -Xseq

and I could echo the wanted value too, if there isn't the need to reboot.

2. What are high-resolution values?

64 or 1024, 2048, 3072 ...?

IIUC it means 1/1024 etc. and the higher, the better the high-resolution 
is, right? 1024 is better than 64?

What are valid values?

I guess 64 and 1024 are fine on my system. What would happen, if I 
choose a value that is too high or to low? Will there be any messages? 
IIRC I once read that the value isn't used, but I might be wrong.

Google wasn't my friend ;). I found similar questions, but no answers.

Cheers,
Ralf