On 01/07/2011 01:32 PM, torbenh wrote: > On Sun, Dec 12, 2010 at 07:22:28PM +0100, Jeremy Jongepier wrote: >> On 12/12/2010 06:42 PM, Ronald Stewart wrote: >>> Hi, >>> >>> I would go with what Robin said. That being said, Robin's tweaks on >>> Transmission last year on 89 set the pace for our build (brilliant!). Since >>> then tuning jack2 (jackdmp) Rui's rtirq, plus tuning for specific chips / >>> computer hardware makes a difference. If you want something now that truly >>> stands up and has had some of the best Linux developers touch the project, >>> go with Transmission 4.2. I know Paul will jump in and tune us all up with >>> our thoughts (go Paul!) but it should be stated again we are getting lights >>> out performance without RT on our new multi-touch Tablets for Pro Audio with >>> 2.6.35, Meego/AtomN450. >> >> So with 2.6.35 rtirq also works with a non real-time kernel? > > i am not aware of normal kernels having threaded irq handlers. No it they do not. > additionally jack2 does not mlockall clients. If the machine as enough RAM or no SWAP partition this won't be a problem. The ability to distribute audio load over multiple CPU cores is a big pro. (tschak was not packaged when building the Transmission disto and we were somewhat conservative, as well). > so basically i would say, that this configuration works is pretty much > luck. Vanilla kernels > 2.6.33 do offer great overall performance: smooth Destkop and acceptable audio performance. Peak performance is for sure better than with the latest RT kernel (2.6.33.7.2-rt30). However that it works _reliable_ is indeed luck. > maybe robin can clarify this. I don't know the details for the new Indamixx tablets, maybe the sound-card (and USB ports for external audio interfaces) are on a dedicated IRQ (they were not on the first generation Indamixx netbooks: the audio IRQ was shared with the graphics card and WiFi; a RT kernel and rtirq was pretty much a requirement) I don't think reliable low latency is a major goal for Indamixx. Most use-cases are quite fine with high latency that can be compensated for. Also see an article I'm just writing with Luis: http://wiki.linuxaudio.org/wiki/jack_latency_tests#does_latency_really_really_matter An occasional rare x-run is probably sth. Indamixx users can live with. After all it is a portable studio, not something super-pro-high-end to be mounted in a studio or used on-stage. Besides overall performance is for sure better than on comparable windows products even without RT kernel. FWIW: Thomas Gleixer has announced that he's working on a RT patch for 2.6.37 but there's no ETA. ciao, robin >> Best, >> >> Jeremy >> _______________________________________________ >> Linux-audio-user mailing list >> Linux-audio-user@xxxxxxxxxxxxxxxxxxxx >> http://lists.linuxaudio.org/listinfo/linux-audio-user > _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
