I have been working for the last few months on a Ubuntu 7.10 based downloadable “Snapshot” of a working Linux A/V setup with Ardour 2.7.1 pre builtwith LV2 FREESOUND WIIMOTE also the latest DSSI-VST, Hydrogen, Rosegarden, QSynth, also with the PAM mods preconfigured and an rtirq script as well as OOTB FFado firewire and Tascam US-122,224,428 support and the ALSA GUI’s for RME, Envy24 etc. It will also include all current development libs for advanced users to build their own Ardours and simplify that “Arduous” task as well. lastly the correct version of WINE for stable VST performance and Window rendering.
I am now ready to upload for distribution however I am not at all happy with the performance of JACK .116.1 and Ardour 2.7.1. Playing existing arrangements I am experiencing numerous xruns and DSP loads up to 20% higher than with JACK 109.2, I built JACK .116.1 from source and have included the necessary mods to fstab, I am using the Ubuntu 7.10 Gutsy -rt kernel which benchmarks significantly higher than the Hardy Kernel and supposedly the Intrepid -rt kernel is currently very poor. Using JACK 109.2 has solved the instability and Xruns, however using Ardour 2.7.1 with JACK 109.2 is requiring me to double my frames per period figures on both my Tascam US-122 and MAudio 1010LT in order to get smooth performance over previous versions, Any Ideas?
In laymans terms what performance benefits should be expected from JACK .116.1 over 109.2 for “normal” DAW use?
The whole purpose of this “Snapshot” is to simplify and get the most recent Linux Audio Apps to new users in as “Ready to Roll” fashion as possible, I am happy with everything except Ardour’s performance and Ardour is what I am most eager to get into the hands of new users!