music December 2014

music@lists.fedoraproject.org

6 participants
5 discussions

Low Latency vs. Real Time Kernel - actual latencies ?
by Be 05 Apr '15

05 Apr '15

Hello Fedora musicians, I've been lurking this list for a little bit and this is my first time chiming in on something. I think it is important to pursue an official realtime kernel for Fedora. I think a distribution focused on audio without a realtime kernel would have a serious bug, that IMO, would be worth delaying publication for. >So I had a beer with hansomepirate(jdulaney), who is, or was on the kernel sig, last night and we got to talking about a RT kernel. > >Last time we talked to the kernel folks about an rt kernel, they weren't impressed with the "need" for Fedora, but that was before the Spin was officially out. > >Now might be a good time to raise this issue again? I dug through my archives and found this thread. Now that we have an actual spin that's out, we can actually redo some of the testing to have more realistic tests. (multitrack with effects) > >I feel like right now, it's one of the few benefits that the ubuntu studio folks have (or at least claim to have) over us. The other is some semi-proprietary software that on... you know what, never mind it's getting off topic. > >Anyways, does the list think this is worth pursuing? > >>On Wed Feb 22 2012 at 9:10:29 PM Brian Monroe <briancmonroe at gmail.com[https://admin.fedoraproject.org/mailman/listinfo/music]> wrote: >> >> Ok, I redid all the tests, while the system was only running my DE and the >> test, and then again when I put it under duress by running a script that >> looped "du -h /" and "ls -Ral /usr/" over and over. I ran the script twice >> to get my proc up a bit to emulate running some intese delays and reverbs >> or other effects. >> >> Ironically the kernels typically did better when the scripts were running. >> Personally I think there's a clear advantage with CCRMA's kernel or even >> just a preempt kernel in the max lat areas. Those max numbers jumped up >> close to where they were near the beggining of the test if anyone was >> wondering. >> >> Here's the file with both sets of tests and the uname -a info as requested >> by Fernando. >> -Brian >> >>> On Wed, Feb 22, 2012 at 6:54 AM, Brian Monroe <briancmonroe at gmail.com[https://admin.fedoraproject.org/mailman/listinfo/music] >>> wrote: >>> I'll be sure to include that on the next batch. I used the kernel you >>> after installing the CCRMA repo when you use yum install kernel-rt, which >>> happens to be 3.0.17-1.rt33.1.fc16.ccrma.x86_64.rt. I'll go back and >>> include the other info to the old results when I do the load testing >>> tonight or tomorrow.

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Need soundcard advice
by William W. Austin 02 Jan '15

02 Jan '15

My wife composes, and for playback she has used an Audigy2 PCI card in her desktop machine for years. That computer is beyond it's last legs now, and her new one has only PCIE slots. (Yes she uses Linux for her composing and playback.) The problem is that she uses the Midi feature of that card and has sound fonts that she loads (about 126 MB in size) into it. She has given up trying to find one and has asked me to help... but so far I've struck out. Are there ANY PCIE sound which is roughly the equivalent of the Audigy 2 cards? I won't say "money is no object", but I'm approaching the point where cost is less important than finding such a card if on exists. Any pointers on this issue will be greatly appreciated. Thanks in advance - Bill -- william w. austin airedad(a)att.net "life is just another phase i'm going through. this time, anyway ..."

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Re: [Fedora-music-list] Low Latency vs. Real Time Kernel - actual latencies ?
by Brian Monroe 01 Jan '15

01 Jan '15

I agree that we need lag to be less than 5ms with no xruns for serious musicians. It makes a difference. I was chatting in #opensourcemusicians about the rt patch issue and someone threw this out there: http://www.funtoo.org/Kernel/configs/realtime I'm smart enough to get what they're doing, but not smart enough to know if this is what we're already doing in Fedora or how it'll affect other security concerns. Also the settings listed for /etc/security/limits.conf is setting you up for a bad time. They said they could get less than 1ms with no xruns (except at application startup) which sounds promising. Certainly if we're shooting for less than 5 ms instead of less than 1ms.

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Re: [Fedora-music-list] Low Latency vs. Real Time Kernel - actual latencies ?
by Jeff Sandys 31 Dec '14

31 Dec '14

Hello Fedora musicians, I've been lurking this list for a little bit and > this is my first time chiming in on something. > > I think it is important to pursue an official realtime kernel for Fedora. > I think a distribution focused on audio without a realtime kernel would > have a serious bug, that IMO, would be worth delaying publication for. > ... > Real Time Kernels are available from PlanetCCRMA: http://ccrma.stanford.edu/planetccrma/mirror/fedora/linux/planetcore/20/x86… There are concerns about the implementation of Real Time Kernel as expressed in the Musician's Guide: http://docs.fedoraproject.org/en-US/Fedora/15/html/Musicians_Guide/sect-Mus… I am not a systems programmer so I can't speak to these concerns. Some of the names of the real time kernel developers listed on the PlanetCCRMA kernel-rt page are Red Hat employees. I would like to see Fedora be the premier linux distribution for music. But until we can overcome the concerns listed in the Musician's Guide we will probably not have a real time kernel in the Fedora repositories. Maybe a Fedora "Re-Mix", or Fedora.Next and Workstation with the works with Fedora software library may break the ice. -- Jeff

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Carla/Cadence
by The name of my band is 1984 22 Dec '14

22 Dec '14

hi, since lv2rack and zynjacku are currently unmaintained (btw, on my F20 install i'm getting runtime errors on both and do not start), i've started playing around Carla/Cadence packages by falkTX. I had to install indicator-cpufreq-selector and change the policy in polkit file and build many missing packages from source to get Cadence working, but now it seem to be ok. i had to update jack_capture to the lateset version as well, in order to obtain freewheeling rendering. i'm wondering if there is any plan to include these packages in the spin by default cheers max

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music December 2014