On 1/11/14, Ralf Mardorf <ralf.mard...@alice-dsl.net> wrote: > Klaus you are mistaken. > > On Fri, 2014-01-10 at 14:09 +0000, Klaus wrote: >> correlation between absolute CPU power and drop-outs > > The issues Zenaan does experience are likely related to jackd, a sound > server that cares about sample accuracy [1].
Could be, but before jackd, I was running pulseaudio, and had the same problems. So then I installed jackd and others, and went on my war of stopping pulseaudio (succeeded), but now, the exact same problem (at least audibly as far as I can tell)! So this problem (to my ears) sounds identical with pulseaudio, as with jackd. Perhaps I could test alsaplayer, direct to hardware, from command line (even no X running), no jackd (don't start it, and check to make sure it's not running), no pulseaudio (got this one handled now :) I shall try when I can afford the workstation downtime - but an hour is usually heaps of time, so I can put on some peaceful reading music, easy to hear glitches in :) > When using jackd, CPU frequency scaling does matter a lot! Well if it matters for jackd, it would probably effect other things (eg pulseaudio, or mpd) too yes? > If you don't believe a professional audio engineer using Linux audio > since around 10 years, perhaps a Linux audio link is able to enlighten > you. > > "CPU frequency scaling daemons that scale the frequency of the CPU > depending on the CPU load could cause xruns in some cases. More recent Again, no xruns here. > versions of Jack1 (>= 0.118.0) are suffering less from xruns or run xrun > free with a CPU frequency scaling daemon enabled that's set to a scaling > governor like ondemand. A specialized CPU scaling daemon is in the works > that depends on the DSP-load instead of the CPU load: jackfreqd" - > http://wiki.linuxaudio.org/wiki/system_configuration A custom cpu governor, just for jackd. Wow! Hard core audio! How far in the "works" part of "in the works" is this jackfreqd ? > JFTR some users might find setting up jackd to complicated, but jackd > provides advantages, e.g. "Within software, jackd provides > sample-accurate synchronization between all JACK applications." - > http://manual.ardour.org/synchronization/on-clock-and-time/ > This does mean, that signals are not out-of-phase, so there won't be > unwanted filtering effects. > The easiness of other sound servers comes at a price. I am happy to learn, how to set up a pro-audio type system with Linux kernel. Right now, I am driven by merely (very) audible and random but consistently occurring, audio drop outs. For a modern machine, something is really wrong if I can't play my music collection! Thanks for all the pointers, Zenaan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/CAOsGNSQncVso0GfYqkk5w=2snkoimvyx0zpdokf5wedy95j...@mail.gmail.com
