[LAU] (Ardour) How to get rid of delay when recording ? - status so far

[jonetsu at teksavvy.com]

On Mon, 15 Feb 2016 12:07:31 +0100
Joakim Hernberg <jhernberg at alchemy.lu> wrote:

>> RTIRQ_NAME_LIST="snd_ice1712"

> Most likely the RTC isn't used at all anymore, check how many times it
> has fired with "cat /proc/interrupts".  One my system it fires exactly
> once during bootup.

Indeed, that's the case.  So no need whatsoever to prioritize rtc in
rtirq.
 
> AFAIK, the only important configuration nowdays is to make sure that
> the soundcard (or usb hub is connected to) is executed first, then
> JACK (which automatically gives the priority of your audio processing
> threads). So I'd suggest to run the soundcard interrupt at a high
> priority, say 95-97 or so (leave 99 for the housekeeping threads).
> Then run JACK at 80 (which will run your audio processing threads at
> 75).

Sounds fine, if I may do a blatant pun. 

top shows the following (hopefully the lines will not be warped in
email) :

 PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
 20   0 5782316 2,821g 133576 S  62,9 18,4 118:16.33 mixbus-3.1.66
  9 -11  219472  90804  83556 S   2,3  0,6   4:33.85 jackd

The priority PR is way out for both.  I know of the nice command,
although how can a higher priority be written into the system
configuration as to no adjust it at every boot ?