On 07/30/2018 12:49 PM, Ralf Mardorf wrote: > Hi, > > by View > Options... > MIDI tab I can chose between 'default', > 'system timer' (for my current installed rt kernels 300Hz), 'HR timer' > and diverse 'PCM' timers. My old computer doesn't have 'TSC', so > Qtractor's queue timer still is set to use 'HR timer', to reduce MIDI > jitter. If I want to chose 'TSC', when running Qtractor on my new > machine, should there be an entry 'TSC' or since it's the current > clocksource, would selecting 'default' be the option to use 'TSC'? IOW > what is 'default' for and why is there no option to select 'TSC'? > > [rocketmouse@archlinux ~]$ cat /sys/devices/system/clocksource/*/available_clocksource > tsc hpet acpi_pm > [rocketmouse@archlinux ~]$ cat /sys/devices/system/clocksource/clocksource0/current_clocksource > tsc > [rocketmouse@archlinux ~]$ qtractor -v > qt5ct: using qt5ct plugin > Qt: 5.11.1 > Qtractor: 0.9.1 > those are low-level, read kernel time/clock sources. instead, the timers that qtractor may use are the high-level ones that are available through ALSA and only; hrtimer is often the default one iif the kernel is configured to CONFIG_SND_SEQ_HRTIMER_DEFAULT=y. you can always check all the available ALSA timers from: /proc/asound/timers the effective current timer in use is listed there, as soon you activate an ALSA seq queue (eg. qtractor): /proc/asound/seq/timer hth. cheers -- rncbc aka. Rui Nuno Capela _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
