[LAU] reducing xruns (System configuration)

Jeanette C. julien at mail.upb.de
Wed Jul 18 18:49:50 CEST 2018


Hi Max,
for a start, do look at /proc/interrupts as suggestd by the script. Looking at 
/proc/asound/cards will also give you a list of your currently recognised ALSA 
soundcards.

Set the IRQ of the soundcard that you want to use for your realtime audio. And 
probably do it with:
export VARIABLENAME=irq_number
(if you're in bash/sh).

Next, you might want to check your swap-space. I had problems with that. My 
hard disk is a little slow and both swapping and recording/streaming from the 
same disk might cause issues. If you're drive is new and fast enough: don't 
worry.

If you're using JACK, check the periods and buffersize. Perhaps it's a little 
low.

The quickscan script didn't find your filesystem types, it appears, unless 
that was only the missing /tmp to which that "not found" referred. Check your 
partition filesystems. You can look at /etc/fstab or /etc/mtab. The first 
specifies how your partitions should be handled, but that might contain the 
odd automatic discovery. mtab gives you the status quo of everything currently 
mounted. Don't worry about all the /proc, /sys and /dev items.

In the end, you might want to install a kernel with realtime preemtion. Since 
it's kubuntustudio, I exptect they have a preemt kernel in their package 
repos.

HTH.

Best wishes,

Jeanette

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