Gustin Johnson wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Ralf Mardorf wrote: > >> Gustin Johnson wrote: >> >>> Have you considered sysctl? >>> sudo sysctl -w dev.hpet.max-user-freq=$hpet_max_user_freq >>> >>> >> Yesno :D. Doing this I've to reboot, right? >> > > No. If you "cat /proc/sys/dev/hpet/max-user-freq" you will see the > updated value. If you reboot you will loose this change unless you put > this value into /etc/sysctl.conf or configure it via a script which runs > at boot time. The default value is 64 and my main DAW this is what I > use. On my primary DAW I prefer to change as little as is necessary. > >>> Having said that, why not have a script that runs at boot time to set >>> this parameter? This is in fact how I accomplish the same task. >>> >>> > To be specific, I use the /etc/sysctl.conf file to set various > parameters at boot, mostly things related to networking (TCP window > scaling, source address verification and some other more esoteric things > because I am a network geek as well). > >> In general you're right, but I'll test several settings. >> >> Btw., what are "good" settings for hpet_max_user_freq? >> > > For this specific variable, I use the default of 64. In fact I did not > know about this particular variable until you posted to this list. Does > it make a difference in audio? > >> Should it be 64, 1024, 2048, 3072 or any other value? >> >> > No idea really. As far as I know, the timer for modern PCs is 1000, for > DEC Alpha it was 1024, and for PIII and older it was 100 (all values in > Hz).
System timer is at 1,000 Hz for real-time kernels, while HR timer is at 1,000,000,000 Hz. I don't know what's the meaning of hpet_max_user_freq, resp. it's a factor, but I don't know what kind of factor, e.g. 1 what-ever / 64 what-another-ever or 1,000,000,000 Hz / 64 what-ever or 64 what-ever / 1,000,000,000 Hz? I do know that MIDI jitter by Linux to equipment external the computer will decrease when using HR timer instead of System timer. I don't know the impact of the value for hpet_max_user_freq. On another list somebody once wrote, that he has to change the value, because mplayer wasn't fine, after he set it to 1024 mplayer was fine. I've got no idea, but to be honest after compiling and installing rtirq, 4 little apps and latest Qtractor, I'll backup my 64 Studio again and then make music without using HPET. This should be tomorrow. I planed to do this yesterday. I saw that Phasex has got an input. Instead of using the oscillators the synth seems to be able to use any input signal for the wave. Toying with some new apps might be more pleasant than making tests with HPET. _______________________________________________ 64studio-users mailing list [email protected] http://lists.64studio.com/mailman/listinfo/64studio-users
