| zequence | OvenWerk1: I have one as well, but I don't use it much and don't have it have home | 00:20 |
|---|---|---|
| zequence | Will do some testing though | 00:20 |
| zequence | Nice breaktrough | 00:20 |
| OvenWerk1 | zequence: sounds good. I was begining to think not much was happening ALSA wise. (not just firewire, but in general) | 00:51 |
| OvenWerk1 | I guess as always the mainstream sound is first. (HDA internal) | 00:52 |
| holstein | OvenWerk1: i know, and mine is out on load to test with right now | 02:01 |
| holstein | out on loan* | 02:01 |
| holstein | im going to try and grab it monday | 02:01 |
| holstein | i have 14.04 installed on my production rig | 02:01 |
| holstein | i could do some partition to test those alsa drivers.. that would be *great*! | 02:02 |
| OvenWerk1 | The only thing that puzzles me about alsa/jack and lowlatency is that cpu speed changes cause problems. | 02:20 |
| holstein | OvenWerk1: yeah, i disable that.. | 02:21 |
| OvenWerk1 | There must be a counter in use that counts cpu cycles | 02:21 |
| OvenWerk1 | Me too, I get sub ms latency with it off. | 02:21 |
| OvenWerk1 | Shouldn't have to though... that is really a bug of sorts... but I don't know where the bug is. | 02:22 |
| holstein | OvenWerk1: how much worse with it on? | 02:22 |
| OvenWerk1 | with it on I get spurious xruns up into 10ms | 02:23 |
| holstein | thats about what i have found | 02:23 |
| OvenWerk1 | I suspect it is one of the kernel timing services. | 02:24 |
| OvenWerk1 | It is actually worse on my new 4 core system than it was on the old P4 single core. | 02:25 |
| OvenWerk1 | But with the cpu set to solid speed the new i5 is really stable | 02:26 |
| holstein | yeah, driver support is really where its at | 02:28 |
| holstein | i have a nice lexicon omega, but, i cant get it below 40ms | 02:28 |
| OvenWerk1 | USB? | 02:28 |
| holstein | yup | 02:29 |
| holstein | whic is fine for what i use it for | 02:29 |
| holstein | i keep the firewire rig packed up ready to travell | 02:29 |
| OvenWerk1 | YaI thought I had looked at one | 02:29 |
| holstein | i leave the lexicon plugged in all the time | 02:29 |
| OvenWerk1 | Anything is better than internal... no matter how high a sample rate it boasts :P | 02:34 |
| holstein | well, at least it has the connectors i want | 02:34 |
| holstein | i bet i get lower latency with the internal though ;) | 02:35 |
| OvenWerk1 | That is another problem with internal audio | 02:35 |
| holstein | but. yeah. i like the lexicon OK | 02:35 |
| OvenWerk1 | internal HDA get 64frames only with 3 periods is the best I can do with any I have played with. | 02:35 |
| OvenWerk1 | 128 frames is more stable. | 02:36 |
| OvenWerk1 | USB has to be the only USB device on a USB bus and that bus has to have it's own irq. On my netbook There was only one USB plug that was stable at 64/2 | 02:37 |
| OvenWerk1 | I have a question with regards to CPU speed. In audio the user needs to be able to set the cpu speed. I am thinking about how best to do this. | 17:10 |
| holstein | OvenWerk1: i'll test with you, if you like | 17:11 |
| holstein | OvenWerk1: i installed cpufrequtils ? i think it was.. and i have 2 shortcuts on my desktop to run in terminal.. i put in my password, and get what i need | 17:12 |
| OvenWerk1 | My thought is there needs to be an easy control that can set speed rather than just ondemand/performance | 17:12 |
| holstein | its not elegant, but, its what ive been doing, and it works for me | 17:12 |
| holstein | OvenWerk1: what about, JACK related? some tickbox that allows JACK to set it when running? | 17:13 |
| holstein | thats probably not cool.. | 17:13 |
| holstein | OvenWerk1: but, yeah.. it would be nice if the user could set it | 17:13 |
| OvenWerk1 | There may be some systems (lap tops?) where performance brings the temp too high. | 17:13 |
| OvenWerk1 | So being able to set a speed that is steady but not to hot would be nice. | 17:14 |
| OvenWerk1 | My thought is a dropdown from systray that has some options for speed. | 17:15 |
| holstein | OvenWerk1: i like that | 17:15 |
| OvenWerk1 | The idea of using a password all the time to me is anoying, it should be possible to make it so that is not needed without compromising security | 17:16 |
| holstein | OvenWerk1: right?! i always thought that too | 17:17 |
| holstein | may be similar to the audio group thing we override | 17:17 |
| OvenWerk1 | My original thought was to use run levels because I also wanted to be able to shut cron off for low latency work. but I have not noticed any problems with it on my new hardware | 17:17 |
| holstein | interesting.. | 17:18 |
| OvenWerk1 | So I think I will make a program in /usr/sbin that needs SU to work but run it with polkit and passwording turned off. | 17:19 |
| OvenWerk1 | The GUI will be user space. | 17:19 |
| OvenWerk1 | (in pyqt4) | 17:19 |
| OvenWerk1 | I already have something like that that changes jack's latency on the fly and enables or not the pulse -> jack bridge | 17:20 |
| OvenWerk1 | The idea is that jackdbus starts when the session does and acts as the backend for pulse for the desktop. | 17:22 |
| OvenWerk1 | At low latency pulse streams to it's dummy output and basically idles. | 17:24 |
| OvenWerk1 | I have two modes with the jack bridge on, desktop and phone use. The second one is low latency with pulse for use with things like skype which is a major use for people doing radio stuff | 17:26 |
| OvenWerk1 | I set up three non-pulse options for live (lowest latency), recording and mixdown. My plan is to have a config screen that the user can set the latency for each mode with. | 17:27 |
| holstein | nice.. i like that | 17:29 |
| OvenWerk1 | I don't know if there is an easy way to find out what the user's audio IF limits are or not. | 17:29 |
| OvenWerk1 | I have 4 devices and all have different limits :) | 17:30 |
| === hobgoblin is now known as elfy | ||
| OvenWerk1 | holstein: Why do people think lowlatency = performance? | 21:37 |
| holstein | OvenWerk1: i know, right?! | 23:38 |
| holstein | OvenWerk1: that guy wasnt ever interested in audio performance, though.. which is fine, but i was treating it like that | 23:39 |
| holstein | if he had said "im running a server" i would have always insisted on a server kernel.. | 23:39 |
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