| OvenWerks | JackWinter1: Low latency kernel yes, rtprio and memlock are available to the user that installs (any other user just needs to be added to the audio group with ubuntustudio-controls) | 00:12 |
|---|---|---|
| OvenWerks | JackWinter1: It tries to set the audio card to a high priority thread... but the fact is it guesses. RTIRQ is installed, but setting it to snd,usb,etc. is rarely right. | 00:13 |
| OvenWerks | snd will include the internal sound card first (probably not what you want) and then all usb be devices next (including mouse and keyboard). | 00:14 |
| JackWinter1 | yes, rtirq is somewhat of a mixed blessing :) | 00:15 |
| OvenWerks | JackWinter1: in general terms, a pc made for windows is not designed for low latency anything in anmy real plug and play way. This is evident from manufature's spec for sound cards which are different for a mac or a windows computer | 00:16 |
| JackWinter1 | so it sounds like it will work well for the first user. and if they ever want to add more users, they'll just have to learn about the audio group.. | 00:17 |
| OvenWerks | rtirq should be user fixed to thge particular cards in use | 00:17 |
| OvenWerks | JackWinter1: if they use ubuntustudio-controls it is quite automatic | 00:17 |
| OvenWerks | (at least the lastest version... unreleased) | 00:18 |
| OvenWerks | The old version does require a password | 00:18 |
| JackWinter1 | i got a thought the other day, and maybe if i find the energy i'll persue it. i think the best solution would be udev rules that change the priority of soundcards when they are detected... should be doable, but i get a headache when i look at the syntax of those files :) | 00:18 |
| OvenWerks | JackWinter1: :) | 00:18 |
| JackWinter1 | would be much better than the generic rtirq script, but still it's better than nothing! | 00:19 |
| OvenWerks | In my opinion, someone using a USB audio interface should (if they can) install another USB card to plug the audio box into. | 00:19 |
| OvenWerks | It removes so many variables | 00:20 |
| JackWinter1 | i don't know, i think that whole can of worms is a difficult topic :) | 00:20 |
| OvenWerks | pc low latency audio is an art | 00:21 |
| JackWinter1 | i just got done looking at av linux, so i guess i'm gonna hit the us site now to see what i can put in the wiki | 00:21 |
| JackWinter1 | oh yes it is... been playing with that for years :) | 00:21 |
| JackWinter1 | is it possible to add a realtime kernel easily to us ? | 00:22 |
| OvenWerks | I can get .7ms one way latency trhough jack if I hold my mouth the right way | 00:22 |
| OvenWerks | if you build the kernel yes. | 00:22 |
| JackWinter1 | hmm, i bet not with a high load...:) | 00:22 |
| JackWinter1 | dsp and loadavg... | 00:23 |
| OvenWerks | there is not one waiting to be used | 00:23 |
| JackWinter1 | so is the case still that it's missing from debian? i thought the situation had changed recently? | 00:23 |
| OvenWerks | it is with a PCI card (delta66) in the right slot, with cron turned off, no wifi stuff, both mouse and kb are ps2, etc. | 00:24 |
| OvenWerks | I don't know what debian has, My understanding is that there are different people who make a RT kernel, but that the support is hit and miss | 00:24 |
| JackWinter1 | i guess not a big need for 0.7, but if one could get 10ms roundtrip latency (including the hidden latency from the usb transport and soundcard hardware) that ought to be ok. | 00:25 |
| JackWinter1 | too bad that it probably means 128 frames buffer with a class 2.0 interface :) | 00:26 |
| OvenWerks | my round trip should be 3.5ish ms | 00:26 |
| OvenWerks | (card mixer is 1ms each way alone) | 00:26 |
| JackWinter1 | but ok, that's just needed for monitoring through daw fx, just for editing and mixing 1024-4096 buffers are totally ok | 00:27 |
| JackWinter1 | yeah pci is much lower roundtrip latency than usb.. | 00:28 |
| JackWinter1 | are you one of the devs? | 00:28 |
| OvenWerks | JackWinter1: the problem is "low latency" means different things to different people. Intel/MS think 30ms is lowlatency. Telephony interfaces run at about 1 ms. CAM runs microsec. | 00:28 |
| OvenWerks | off and on. | 00:29 |
| OvenWerks | I spend too much time on Ardour these days. | 00:29 |
| JackWinter1 | personally i think if it sounds like i'm a few meters away from my amp it's ok. | 00:29 |
| OvenWerks | Ya, I can use my computer as a guitar effect up to about 128/2 | 00:30 |
| JackWinter1 | vocalist monitoring through headphones might possibly want lower than me. and what ms thinks, is not really relevant :) | 00:30 |
| OvenWerks | Relevence is what the hardware is designed for. | 00:31 |
| JackWinter1 | is there some text from the US site that i can lift for the wiki to introduce people to US? similar to what i did for av linux? | 00:31 |
| JackWinter1 | http://wiki.cockos.com/wiki/index.php/REAPER_for_Linux | 00:32 |
| OvenWerks | web site stuff is not my thing at all. there is ubuntustudio.org, but what is where I am not sure | 00:32 |
| JackWinter1 | someday linux audio will get so big, that even rme will write drivers for it :) | 00:32 |
| OvenWerks | To get there would almost take someone making an audio centered mother board | 00:34 |
| JackWinter1 | ok, i'll idle here, in the hope that another dev can point me to something. thanks for your time and answers, think i know all i need about the distro now, but will read some of the site to see what i can find | 00:34 |
| OvenWerks | but with Apple starting to cheap out on the audio parts of their hardware.. something might show up. | 00:34 |
| JackWinter1 | don't think so, rme's usb offerings are quite low latency on windows, but then again they don't use the standard usb stack... | 00:35 |
| JackWinter1 | and i guess we'll start seeing more stuff like dante etc as the years go by too | 00:35 |
| OvenWerks | USB3 might change things too. | 00:35 |
| OvenWerks | I think if things go right AVB might do well. | 00:36 |
| JackWinter1 | yeah i have no experience with usb3 sound cards, so no clue if things will improve | 00:36 |
| OvenWerks | right now there really are no usb3 cards unless they are audio as well | 00:36 |
| OvenWerks | if I was buying something right now it would either be one of the audioscience PCIe cards (which do have linux drivers) or one of the MOTU AVB series whic will work right now with USB and later with AVB. | 00:38 |
| JackWinter1 | the new motus do look nice, and seem to promise hope for us penguinistas :) | 00:39 |
| OvenWerks | There is some talk of them (and some other USB interfaces) mixing up the channels sometimes. Not sure what that is. | 00:40 |
| JackWinter1 | fwiw, this is a start i guess, hope you guys approve, if not please let me know: http://wiki.cockos.com/wiki/index.php/REAPER_for_Linux#Ubuntu_Studio_-_https:.2F.2Fubuntustudio.org | 01:16 |
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| === meetingology` is now known as meetingology | ||
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