Mulyadi Santosa schrieb: > hello everyone > > One thing that draws my attention is MIDI playing. So far, by using > Timidity and ALSA, I tried to play several MIDI files and it is hard for > me to notice any lag. I only noticed delayed notes when system is under > busy load (I run CPU bound program with nice level above -9). > > Things I'd like to discuss are (I am sorry if they sound dumps > because I still study all these stuffs): > > 1. Is it me just who is not professional enough to notice any difference > when using various kernel HZ setting (smooth playing on HZ=x, not so smooth > when HZ=y and so on)? Or, does the delay fall in non-human-perceptible > range thus normal human being can not see the difference? > > 2. Is it correct that recent ALSA sequencer use RTC as source timer thus > kernel HZ is no longer relevant in the sequencer's point of view? > > 3. Related to the system load I mentioned above, I think I was seeing > scheduling latency and not really a timing latency. If that's correct, > could you kindly suggest what I must do to show that MIDI timing does > have any relation with HZ? > > 4. I am also thinking about MIDI recording as a way to show HZ effect. > Since I don't have any MIDI devices (but I plan to buy one if it's > really neccessary), I'd like to explore the correctness of this idea > first. Do you think it is really a proper experiment in HZ test context? > > > Thank you in advance for your help and attention and I am looking > forward to read your feedback. Sorry if it has been discussed before, > but I fail to completely research it until today. > > regards, > > Mulyadi > > _______________________________________________ > Linux-audio-dev mailing list > [email protected] > http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev > Hi I have dev.rtc.max-user-freq = 8192 in my sysctl.conf. Before seq24 timing seemed to be changing between laid back and forward. Haven't tested since setting. Do cat /proc/sys/dev/rtc/max-user-freq to see your setting now. echo 8192 > /proc/sys/dev/rtc/max-user-freq changes setting.
Uli _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo.cgi/linux-audio-dev
