[ardour-users] noise during playback

Sampo Savolainen v2 at iki.fi
Sat Mar 31 07:32:33 PDT 2007

On Sat, 2007-03-31 at 16:16 +0200, Jordi Farran wrote:
> No, I am not using realtime in jackd. I believe I need to recompile
> the kernel or something to run it with realtime privileges; am I
> wrong? About parameters for jackd, I am not sure: I use qjackctl, so I
> do not directly using comand line parameters. I am running kernel
> 2.6.18 (optimized for 686), Debian distribution.
> Many thanks,

You do not need to recompile a kernel. You just need to run jackd with
the -R flag. If your system is set up properly, it will Just Work(tm).
If it says it can't get rights, then you should google around for how to
set up pam on debian to do that, or see if this is enough information
for you:


The noise you are hearing is most likely xruns. If your system is not
capable of doing RT like it is, you can try to increase the buffer size
and maybe the number of periods per buffer. If you are doing "serious
work", I advice strongly against running without -R.

Btw. the memlock limit in the opensrc.org page is a bit weird. Use at
least 500000 .


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