Linux-audio-user

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6 participants
20644 discussions

System Configuration: kernel, CPU frequency, hardware timers

by Kevin Cosgrove

Hi folks, Back in 2012 I scripted some post-installation customization for when I would build a new Linux machine. I suspect that all of what I did is no longer needed for today's systems. I'm writing to see if someone can confirm that. What I did came from these links: https://wiki.linuxaudio.org/wiki/system_configuration#the_kernel https://wiki.linuxaudio.org/wiki/system_configuration#cpu_frequency_scaling https://wiki.linuxaudio.org/wiki/system_configuration#hardware_timers My new system runs the 4.17.17 kernel along with the rest of Fedora-27. What do you think? Do I need to taylor the new machine in the above ways? Thanks! P.S.: My script is below, for the curious. #!/bin/sh # $Id: 36-linux_musicians,v 1.4 2012/11/16 05:56:14 kevinc Exp $ DATE=`date +%F-%T` # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#the_kernel sudo cp /etc/default/grub /etc/default/grub-${DATE} sudo cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg-${DATE} # cp /etc/default/grub grub sudo perl -p -i -e 's/(^GRUB_CMDLINE_LINUX=\"nomodeset.*rhgb) quiet$\"/$1 quiet threadirqs\"/' /etc/default/grub sudo /sbin/grub2-mkconfig -o /boot/grub2/grub.cfg # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#cpu_frequen… # echo -n performance \ # | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor sudo touch /etc/rc.d/rc.local cp /etc/rc.d/rc.local rc.local_cpufreq cat << EOF >> rc.local_cpufreq #!/bin/sh for cpu in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor do echo -n performance > \$cpu done echo 3072 > /sys/class/rtc/rtc0/max_user_freq EOF sudo cp rc.local_cpufreq /etc/rc.d/rc.local sudo chmod 755 /etc/rc.d/rc.local # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#hardware_ti… /bin/rm -f 40-timer-permissions.rules cat << EOF > 40-timer-permissions.rules KERNEL=="rtc0", GROUP="audio" KERNEL=="hpet", GROUP="audio" EOF sudo cp 40-timer-permissions.rules /etc/udev/rules.d/ sudo chmod 644 /etc/udev/rules.d/40-timer-permissions.rules cat << EOF > 60-max-user-freq.conf # High Precision Event Timer for performance audio/MIDI dev.hpet.max-user-freq=3072 EOF sudo cp 60-max-user-freq.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-max-user-freq.conf cat << EOF > 60-vm.swappiness.conf # Delay start of use of swap partitions vm.swappiness = 10 EOF sudo cp 60-vm.swappiness.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-vm.swappiness.conf cat << EOF > 93-audio_limits.conf # Increase priority of audio applications # # maximum realtime priority @audio - rtprio 90 # maximum locked-in-memory address space (KB) @audio - memlock 2000000 EOF sudo cp 93-audio_limits.conf /etc/security/limits.d/ sudo chmod 644 /etc/security/limits.d/93-audio_limits.conf exit

6 years, 11 months

noise problem, need some help

by Dave Phillips

Greetings, Recently my computer rebooted after a power outage and after having an uptime of many months. I'm running Fedora 23 here, with Fernando's rt kernel from Planet CCRMA, on hardware that includes an AMD FX6300, 16G memory, a big hard drive, and nVidia graphics. For those months of uptime I've enjoyed a smooth-running system with very few issues. The CPU runs in performance mode, and as far as I can tell the system has been sweetly optimized for realtime audio. Alas, after rebooting I now have extremely annoying issues with noise from my wireless mouse when running VCV Rack, which is a problem I never had before the reboot. I suspect IRQ assignment, but I'm awfully rusty at troubleshooting so I'm asking the group for advice. My checklist so far: 1. Running the correct kernel ? Linux The6300 4.6.7-200.rt14.1.fc23.ccrma.x86_64+rt #1 SMP PREEMPT RT Sat Oct 1 16:06:12 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux 2. CPU in Performance mode ? 'cat /proc/cpuinfo' reports 'cpu MHz: 3500.000' for all cores 3. rtprio set ? $ rtirq status PID CLS RTPRIO NI PRI %CPU STAT COMMAND 169 FF 70 - 110 0.0 S irq/8-rtc0 748 FF 69 - 109 0.0 S irq/19-snd_hda_ 764 FF 69 - 109 2.0 S irq/20-snd_ice1 166 FF 68 - 108 0.0 S irq/1-i8042 85 FF 50 - 90 0.0 S irq/9-acpi 138 FF 50 - 90 0.0 S irq/22-ahci[000 150 FF 50 - 90 0.0 S irq/17-ehci_hcd 151 FF 50 - 90 0.0 S irq/19-ehci_hcd 153 FF 50 - 90 0.0 S irq/16-ohci_hcd 154 FF 50 - 90 0.0 S irq/16-ohci_hcd 155 FF 50 - 90 0.0 S irq/18-ohci_hcd 156 FF 50 - 90 0.0 S irq/18-ohci_hcd 159 FF 50 - 90 0.0 S irq/18-ohci_hcd 430 FF 50 - 90 0.0 S irq/14-pata_ati 431 FF 50 - 90 0.0 S irq/15-pata_ati 706 FF 50 - 90 0.0 S irq/7-parport0 1062 FF 50 - 90 0.0 S irq/26-enp2s0 1178 FF 50 - 90 0.8 S irq/27-nvidia ... Permissions are correct, and I have already tried switching the wireless dongle to a different USB port. So what am I missing, what have I forgotten ? The machine is the same as before the reboot, the kernel is the same, and as far as I can tell the audio system is the same as it ever was. I'm at a bit of a loss here, any and all help will be appreciated. Best regards, dp

6 years, 11 months

Up-to-date RtAudio tutorial examples?

by Jeanette C.

Hey hey, just looking into RtAudio, I find that the only online tutorial that comes up is the one from the MIT and it is quite out of date, working with version 3.0, opposed to 5.0. There are a few examples in the gitHub project, but is there another modern "tutorial" to get to grips with it? TIA and best wishes, Jeanette -------- * Website: http://juliencoder.de - for summer is a state of sound * SoundCloud: https://soundcloud.com/jeanette_c * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * GitHub: https://github.com/jeanette-c * Twitter: https://twitter.com/jeanette_c_s Don't care about money It doesn't give me half the thrill <3 (Britney Spears)

6 years, 11 months

JACK_NO_AUDIO_RESERVATION

by Minie

Hi, I am a user of Archlinux ARM with Raspberry pi3. When starting JACK, the following error appears. Failed to connect to session bus for device reservation: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11. To bypass device reservation via session bus, set JACK_NO_AUDIO_RESERVATION=1 prior to starting jackd. I attempted to append JACK_NO_AUDIO_RESERVATION=1 to jackdrc, but jackdrc is missing anywhere. Please tell me how to avoid errors. Minie -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-user-f5.html

6 years, 11 months

Updates

by Fons Adriaensen

Hello all, Updates are available at <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> for all of the following: aeolus-0.9.7 ambdec-0.7.1 clthreads-2.4.2 clxclient-3.9.2 ebumeter-0.4.2 jaaa-0.9.2 jack_delay-0.4.2 jack_utils-0.0.1 japa-0.9.2 jconvolver-1.0.2 jkmeter-0.6.5 jmatconvol-0.3.3 jmeters-0.4.4 jnoisemeter-0.2.2 octofile-0.3.2 tetraproc-0.8.6 yass-0.1.0 zita-ajbridge-0.8.2 zita-alsa-pcmi-0.3.2 zita-at1-0.6.2 zita-bls1-0.3.3 zita-convolver-4.0.2 zita-dpl1-0.3.3 zita-jclient-0.4.2 zita-lrx-0.1.2 zita-mu1-0.3.3 zita-njbridge-0.4.4 zita-resampler-1.6.2 zita-rev1-0.2.2 For most of them this is just small bug fixes, general maintenance, and above all a systematic cleanup of the Makefiles. Also the jacktools python package (presented at LAC 2018) is available now. I actually did upload the files just before the conference, but forgot to update index.html... Ciao, -- FA

6 years, 11 months

aeolus, compiled and repos

by tom haddington

Ah, a couple of responses while running an errand! Here goes: Francesco: i run aeolus through jack. i attempted to run it through alsa, but was told that aeolus could not connect to alsa. This happened when setting the sample rate to both 44100 and 48000. It turns out that stops is installed, though it is the version that came with the distro. it just never occurred to me that stops and aeolus would be installed as separate programs. Could it be that the newer compiled version is butting heads with this? David: The architecture is 64bit. My apologies for not mentioning that. My projects are not quite in order enough for me to upgrade to 18.04, though it was my plan to do so in the next few weeks. That's what i was thinking: The path to definitions is not clearly defined. i've never learned the format for setting those paths. i've half a head to uninstall stops and recompile the newer version to see if that solves anything. Given the morning's plans, though, i'm a few hours away from that.... Thank you, Francesco and David, for your responses. tom

6 years, 11 months

aeolus, compiled and repos

by tom haddington

Well, well, well, Francesco, that fixed the problem immediately! i've spent the last few minutes listening to a Bach fugue in a variety of temperaments. Aeolus doesn't remember the path, but i can jigger with a script. This can now be considered solved. Thank you so much for your help! tom

6 years, 11 months

New DACs, perhaps 384k bluetooth, with Linux?

by Jonathan E. Brickman

Well, my lovely Onyx Artist 1-2 is not powering up consistently, so it's time to look for a new DAC for the Box of No Return . I did a mid-deep survey last night, and am fascinated at the newly large category of "headphone amplifiers", all of them USB2 or 3 and usually driverless, some of them bluetooth, several of them (e.g., this FiiO, this Fosi, many others) advertising bluetooth 4.2 or 5.0 and 384kHz max sampling rates and four or five codecs I had never heard of. I'd like to spend vaguely US$100, am willing to consider higher. I prefer dual 1/4" mono phone jack outs, or single or dual XLR; the Peavey USB-P would be great if it were 96kHz; but the "headphone amplifier" category clearly goes for 1/8" stereo, not my favorite because they wear out so easily. I'd love to go 96kHz bluetooth if it's solid under Linux with JACK, but my impressions thus far is that that may be a path fraught with peril :-) I don't actually need minimum latency, I do need high reliability. Experiences anyone? Thoughts and recommends? -- Jonathan E. Brickman jeb(a)ponderworthy.com (785)233-9977 Hear us at ponderworthy.com -- CDs and MP3 available! Music of compassion; fire, and life!!!

6 years, 11 months

aeolus, compiled and repos

by tom haddington

Hello, All-- i'm running Ubuntu Studio 16.04, for starters. The Aeolus that came with the distro simply closes upon starting. It also crashes patchage when doing so. i really got no error, not even a seg fault, except that the terminal told me that Aeolus couldn't read ~/.aeolus-presets. So, i went to the website and downloaded the latest version. After compiling. Aeolus would start, but no stops are displayed. The terminal tells me, "Can't open 'stops/Aeolus/definition' for reading." This is very unfortunate. A few years ago, i gave a temperament lecture and relied heavily on Aeolus. i'd like to know that i can give it again. Any help would be appreciated. Take care, tom

6 years, 11 months

Experiences with audio interface Roland Rubix24?

by Peter P.

Hi list, considering to buy a Roland Rubix24 interface as a successor to my trusty Edirol UA24. Does anyone have any experience with it under linux? Especially I am wondering if it accepts sample rate and buffer size changes from alsa and jack and about an issue with the interface switching itself off after about ten hours as reported on https://linuxmusicians.com/viewtopic.php?t=17233 Thank you for all hints! P

6 years, 11 months

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Linux-audio-user