On Wed, 2011-04-06 at 14:40 +0200, ailo wrote: > On 04/06/2011 12:54 PM, Ralf Mardorf wrote: > >> How have you tested? What results have you obtained? If you want > >> convince someone else you should provide testing procedures and > >> numeric results. > > > > If I play a MIDI track with external MIDI equipment, DX7, Matrix-1000, > > D4, TG33 and others with 1000 Hz timer and record it to an audio track > > and watch the files by Audacity, I can see that there's more jitter, > > than when using the HR timer. > > I also recorded kick, hi hat and snare one after the other and the > > rhythm didn't groove anymore. > > On LAD, 64 Studio lists, perhaps JACK devel and others too I posted > > tests years ago. All regarding to this issue and other sync issues, > > because Linux lacks on sync. > > > > How recently have you tested -generic and -lowlatency? > > > -- > ailo >
I didn't really tested 'lowlatency', because even the RT-patch doesn't fit to my needs, hence I suspect that preemption only wouldn't be ok, even if it should be as good as preemption rt. I once used a preemption only kernel, had some issues, asked for help at JACK devel list or another list and they asked me to use a kernel preemption + rt. IIRC the issue had nothing to do with the preemption only kernel, it still was there when using a preemption + rt kernel, anyway, if you report async issues and xruns and stuff like that for jackd, resp. jackd clients and you aren't using a kernel-rt, the first hint you'll get, is to use a kernel-rt and depending to the kind of problem, nobody will take a look to your issues, before you do this. Default and vanilla kernels don't do what I do need. For this I don't need to do tests, resp. launching an audio app and just moving the ps2 mouse will demonstrate the limitations of a default kernel(-desktop, -generic or what ever a distro does call the default kernel). Greetz, Ralf -- Ubuntu-Studio-users mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users
