JackAudio July 2019

jackaudio@lists.linuxaudio.org

8 participants
4 discussions

by liebrecht＠grossmann-venter.com

Anyone have an in depth treatise on xruns and how to minimize them. By that I dont mean just adjusting the buffer size, I mean really getting into the gears of why xruns happen and how to potentially minimize them. Reason I ask is that I use jack on a live music basis amd it is crucial for me to get no more than 2.9ms latency. I can hear and feel every latency above above that. I am lucky with mixbus and jack on Linux to get 2.9ms with the occasional xrun every 2 minutes, but I want to see if I cannot eliminate them. Any advice or point to very relevant reference material will be appreciated. Thanks

3 years, 7 months

[Jack-Devel] api query

by Miartus, Adam (Arion Recruitment; ADITG/ESM)

Hello all, Last week I was working with jack api and noticed what I think might be an inconsistency with API and documentation @ http://www.jackaudio.org/api/intclient_8h.html#a39135e63b8bf46844b9e57c4fe8… http://www.jackaudio.org/api/intclient_8h.html#aff038e9c251a2cdf4a5ce94d9d0… namely functions: int jack_internal_client_handle int jack_internal_client_load they mention - returns int and accepts input parameter "jack_intclient_t handle", which should rather be: "returns jack_intclient_t" and remove the "handle" function parameter which is not there. Or maybe Im misunderstanding something? Best regards Adam Miartus Engineering Software Multimedia (ADITG/ESM) Tel. +49 5121 49 6979

3 years, 7 months

Re: [Jack-Devel] advice on xruns (fwd)

by Holger Marzen

I found audit=0 on https://www.kernel.org/doc/html/v4.14/admin-guide/kernel-parameters.html ---------- Forwarded message ---------- Date: Sun, 28 Jul 2019 10:32:15 +0200 (CEST) From: Holger Marzen <holger(a)marzen.de> To: Ralf Mardorf <ralf.mardorf(a)alice-dsl.net> Cc: liebrecht(a)grossmann-venter.com, jack-devel(a)lists.jackaudio.org Subject: Re: [Jack-Devel] advice on xruns On Sun, 28 Jul 2019, Ralf Mardorf wrote: > On Sun, 28 Jul 2019 08:40:07 +0200 (CEST), Holger Marzen wrote: > >"nohz=off threadirqs noibrs noibpb nopti > >nospectre_v2 nospectre_v1 l1tf=off nospec_store_bypass_disable > >no_stf_barrier mds=off mitigations=off quiet splash" > > With those spectre mitigations turned off, it still might be of value > to disable audit, see > https://lists.archlinux.org/pipermail/arch-general/2018-September/045580.ht…. Can I disable it on the kernel command line if it's compiled in the kernel? > Why do you disable nohz? Got an error message in syslog, googled a bit, disabled it without deeper knowledge.

3 years, 7 months

[Jack-Devel] Volume much softer on Jack than on ALSA/PulseAudio?

by Alyssa Vance

I'm running an ALSA -> PulseAudio -> Jack bridge setup on an Ubuntu 18.04 x86 laptop. Sound played via ALSA directly seems to be much louder than via Jack, eg.: gst-launch-1.0 audiotestsrc freq=200 volume=1.0 ! alsasink is much louder than gst-launch-1.0 audiotestsrc freq=200 volume=1.0 ! jackaudiosink I've looked at every volume knob I can find (via alsamixer, qasmixer, pactl list, etc.), and they're all at 100%. Does the PulseAudio -> Jack bridge have a volume parameter hidden in a config file, or something like that? Thanks.

3 years, 8 months

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JackAudio July 2019