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| alex-EU | JackWinter_: Afternoon. The RT kernel has helped halve the latency. I'm still above your settings, but i'm shoving a lot at once here, so it's quite good for my use case. | 15:24 |
|---|---|---|
| alex-EU | falktx: afternoon. A question. In KDE, i can choose from various settings for compositing/rendering. There's 3 OpenGL settings, and a choice of the type of QT render. Can you recommend which combination works best for you, based on your experience. I'm currently set on OpenGL 3.1, and QT native. | 15:28 |
| falktx | opengl 2, qt raster | 15:36 |
| falktx | raster is always faster than native | 15:37 |
| falktx | not all cards support gl 2 nicely. surely not intel ones | 15:37 |
| falktx | but nvidia should be fine | 15:37 |
| alex-EU | falktx: ok, thanks. | 15:40 |
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| alex-EU | falktx: it's improved. | 15:52 |
| JackWinter_ | alex-EU: that's what i keep saying to people :) i suppose most start an idle jack server hold their breath and when there are no xruns in a few minutes they repeat the mantra that low latency is good enough :) not that i want to call anyone a liar, but seeing the kernel scheduling latencies i just don't understand how lowlat would be good enough | 15:54 |
| JackWinter_ | if you have a recent nivida card there is a patch you ought to use, as -rt has reliably hung X for me without it | 15:56 |
| alex-EU | JackWinter_: particularly for my type of use case. | 15:56 |
| alex-EU | JackWinter_: I'm using the nouveau driver. Never had any luck with the blob. | 15:56 |
| alex-EU | JackWinter_: works ok enough for my 2D work. | 15:56 |
| JackWinter_ | been thinking about your plugin priorities. don't know how it all works in carla, but i'm not sure they all have to be rt. as the jack callback thread is rt, and that is the one that will execute the audio loop in your plugins... | 15:57 |
| JackWinter_ | ah nouveau, i don't think that has the same problem | 15:57 |
| JackWinter_ | you can't use the intel built into your cpu? imo the best for lowlatency | 15:58 |
| falktx | JackWinter_: it's a separate process synced via semaphore | 15:58 |
| falktx | JackWinter_: the 2nd process doens't have rt prio setup yet, I'll do that soon | 15:58 |
| * JackWinter_ shudders, semaphores are not really all that nice if you want really low latency | 15:59 | |
| JackWinter_ | that's how wineasio used to do it, before it got fixed | 15:59 |
| alex-EU | JackWinter_: No, the MB i use doesn't haved intel graphics embedded. The next one will, as i constantly read how reliable intel is for graphics. | 15:59 |
| falktx | JackWinter_: there's no other way that I know of syncing audio between *processes* | 16:00 |
| falktx | not threads, different processes | 16:00 |
| JackWinter_ | maybe futexes? | 16:00 |
| JackWinter_ | at least they say they are very fast | 16:00 |
| JackWinter_ | so each plugin gets to process the audio and then sets a semaphore for the next one to start? | 16:01 |
| JackWinter_ | actually i don't know if futexes can be used across different processes... | 16:02 |
| falktx | I think it's the same design as jack | 16:02 |
| falktx | I copied some code from dssi-vst, which copied code from jack1 | 16:03 |
| JackWinter_ | well i don't know how jack does it. just have heard that one ought to stay away from semaphores for realtime programming | 16:03 |
| falktx | it needs a way to sync audio | 16:04 |
| falktx | "Implementors are expected to be assembly literate and to have read the sources of the futex user-space library referenced below." | 16:12 |
| alex-EU | Or Botoxes. For wrinkle free audio playback? | 16:13 |
| * alex-EU says sorry. No sleep, and well into the silly zone........... | 16:14 | |
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| JackWinter_ | falktx: whee, that's encouraging documentation :) | 16:19 |
| JackWinter_ | alex-EU: fwiw, my kde settings are opengl 3.1 and native | 16:20 |
| JackWinter_ | don't know if it makes much difference, but maybe i ought to play with them again | 16:21 |
| alex-EU | JackWinter_: Raster seems to make a difference. Not getting audible audio glitches when i switch desktops. | 16:27 |
| alex-EU | JackWinter_: of course, YMMV. :) | 16:27 |
| JackWinter_ | yes :) | 16:34 |
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| Staffan | Hi! I have recently installed a fresh copy of KXStudio 14.04.1. When I run Muse 2.2, I can't see "SimpleDrums". If I run Muse from the command line, it says: initMidiSynth: MESS dlopen(/usr/lib/muse/synthi/simpledrums.so) failed: /usr/lib/muse/synthi/simpledrums.so: undefined symbol: sf_close | 17:58 |
| Staffan | I thought that sf_close is in libsndfile1 (which I have), but it isn't in the simpledrums.so dependencies (using ldd)... | 17:59 |
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