7 Nov
2009
7 Nov
'09
8:04 a.m.
Emanuel Rumpf wrote:
Hi
I'm confused about all the timers.
There is:
- system timer
- hpet (high precision event timer)
- hr-timer (high resolution timer)
- rtc (real time clock)
- cyclic (what's that? a coded loop?)
- anything else ?
What is the relation of all these ?
Which hardware devices are actually used by those ?
Which is the prefered timer for sequencing ? hr-timer / rtc ?
If hardware is fine with Linux real-time audio, if I understand
correctly, the preferred timer for MIDI sequencers is (should be) system
timer at ! 1000 Hz ! For my hardware, that has got problems with
real-time audio, it's PCM playback and PCM capture. Using this timers
MIDI jitter will decrease a little bit.
This is the output I get for 64 Studio 3.0-beta3:
spinymouse-sudo@64studio:~$ cat /proc/asound/timers
G0: system timer : 1000.000us (10000000 ticks)
P0-0-0: PCM playback 0-0-0 : SLAVE
P0-0-1: PCM capture 0-0-1 : SLAVE
Client sequencer queue 0 : stopped